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Geography (from Ancient Greek γεωγραφία geōgraphía; combining gê 'Earth' and gráphō 'write') is the study of the lands, features, inhabitants, and phenomena of Earth. Geography is an all-encompassing discipline that seeks an understanding of Earth and its human and natural complexities—not merely where objects are, but also how they have changed and come to be. While geography is specific to Earth, many concepts can be applied more broadly to other celestial bodies in the field of planetary science. Geography has been called "a bridge between natural science and social science disciplines."

Origins of many of the concepts in geography can be traced to Greek Eratosthenes of Cyrene, who may have coined the term "geographia" (c. 276 BC – c. 195/194 BC). The first recorded use of the word γεωγραφία was as the title of a book by Greek scholar Claudius Ptolemy (100 – 170 AD). This work created the so-called "Ptolemaic tradition" of geography, which included "Ptolemaic cartographic theory." However, the concepts of geography (such as cartography) date back to the earliest attempts to understand the world spatially, with the earliest example of an attempted world map dating to the 9th century BCE in ancient Babylon. The history of geography as a discipline spans cultures and millennia, being independently developed by multiple groups, and cross-pollinated by trade between these groups. The core concepts of geography consistent between all approaches are a focus on space, place, time, and scale.

Today, geography is an extremely broad discipline with multiple approaches and modalities. There have been multiple attempts to organize the discipline, including the four traditions of geography, and into branches. Techniques employed can generally be broken down into quantitative and qualitative approaches, with many studies taking mixed-methods approaches. Common techniques include cartography, remote sensing, interviews, and surveying. (Full article...)

Outline of geography · Index

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  • Image 1 The Count of Porto Alegre around age 61, c. 1865 Manuel Marques de Sousa, Count of Porto Alegre (13 June 1804 – 18 July 1875), nicknamed "the Gloved Centaur", was an army officer, politician and abolitionist of the Empire of Brazil. Born into a wealthy family of military background, Manuel Marques de Sousa joined the Portuguese Army in Brazil in 1817 when he was little more than a child. His military initiation occurred in the conquest of the Banda Oriental (Eastern Bank), which was annexed and became the southernmost Brazilian province of Cisplatina in 1821. For most of the 1820s, he was embroiled in the Brazilian effort to keep Cisplatina as part of its territory: first during the struggle for Brazilian independence and then in the Cisplatine War. It would ultimately prove a futile attempt, as Cisplatina successfully separated from Brazil to become the independent nation of Uruguay in 1828. A few years later, in 1835 his native province of Rio Grande do Sul was engulfed in a secessionist rebellion, the Ragamuffin War. The conflict lasted for almost ten years, and the Count was leading military engagements for most of that time. He played a decisive role in saving the provincial capital from the Ragamuffin rebels, allowing forces loyal to the legitimate government to secure a key foothold. In 1852, he led a Brazilian division during the Platine War in an invasion of the Argentine Confederation that overthrew its dictator. He was awarded a noble title, eventually raised from baron to viscount and finally to count. (Full article...)

    The Count of Porto Alegre around age 61, c. 1865

    Manuel Marques de Sousa, Count of Porto Alegre (13 June 1804 – 18 July 1875), nicknamed "the Gloved Centaur", was an army officer, politician and abolitionist of the Empire of Brazil. Born into a wealthy family of military background, Manuel Marques de Sousa joined the Portuguese Army in Brazil in 1817 when he was little more than a child. His military initiation occurred in the conquest of the Banda Oriental (Eastern Bank), which was annexed and became the southernmost Brazilian province of Cisplatina in 1821. For most of the 1820s, he was embroiled in the Brazilian effort to keep Cisplatina as part of its territory: first during the struggle for Brazilian independence and then in the Cisplatine War. It would ultimately prove a futile attempt, as Cisplatina successfully separated from Brazil to become the independent nation of Uruguay in 1828.

    A few years later, in 1835 his native province of Rio Grande do Sul was engulfed in a secessionist rebellion, the Ragamuffin War. The conflict lasted for almost ten years, and the Count was leading military engagements for most of that time. He played a decisive role in saving the provincial capital from the Ragamuffin rebels, allowing forces loyal to the legitimate government to secure a key foothold. In 1852, he led a Brazilian division during the Platine War in an invasion of the Argentine Confederation that overthrew its dictator. He was awarded a noble title, eventually raised from baron to viscount and finally to count. (Full article...)
  • Image 2 Honório Hermeto Carneiro Leão, Marquis of Paraná, at age 55, 1856 Honório Hermeto Carneiro Leão, Marquis of Paraná (11 January 1801 – 3 September 1856) was a Brazilian politician, diplomat, judge and monarchist. Paraná was born to a noble family in São Carlos do Jacuí, in what was then the captaincy of Minas Gerais. After attending the University of Coimbra in Portugal and having returned to Brazil, Paraná was appointed a judge in 1826 and later elevated to appellate court justice. In 1830, he was elected to represent Minas Gerais in the Chamber of Deputies; he was re-elected in 1834 and 1838, and held the post until 1841. In the aftermath of emperor Pedro I's abdication in 1831, a regency created to govern Brazil during the minority of the former emperor's son, Pedro II, soon dissolved into chaos. Paraná formed a political party in 1837 that became known as the Reactionary Party, which evolved into the Party of Order in the early 1840s and in the mid-1850s into the Conservative Party. He and his party's stalwart and unconditional defence of constitutional order allowed the country to move beyond a regency plagued by factious disputes and rebellions that might easily have led to a dictatorship. Appointed president of Rio de Janeiro Province in 1841, Paraná helped put down a rebellion headed by the opposition Liberal Party the following year. Also in 1842, he was elected senator for Minas Gerais and appointed by Pedro II to the Council of State. In 1843, he became the de facto first president (prime minister) of the Council of Ministers, but resigned after a quarrel with the emperor. (Full article...)

    Honório Hermeto Carneiro Leão, Marquis of Paraná, at age 55, 1856

    Honório Hermeto Carneiro Leão, Marquis of Paraná (11 January 1801 – 3 September 1856) was a Brazilian politician, diplomat, judge and monarchist. Paraná was born to a noble family in São Carlos do Jacuí, in what was then the captaincy of Minas Gerais. After attending the University of Coimbra in Portugal and having returned to Brazil, Paraná was appointed a judge in 1826 and later elevated to appellate court justice. In 1830, he was elected to represent Minas Gerais in the Chamber of Deputies; he was re-elected in 1834 and 1838, and held the post until 1841.

    In the aftermath of emperor Pedro I's abdication in 1831, a regency created to govern Brazil during the minority of the former emperor's son, Pedro II, soon dissolved into chaos. Paraná formed a political party in 1837 that became known as the Reactionary Party, which evolved into the Party of Order in the early 1840s and in the mid-1850s into the Conservative Party. He and his party's stalwart and unconditional defence of constitutional order allowed the country to move beyond a regency plagued by factious disputes and rebellions that might easily have led to a dictatorship. Appointed president of Rio de Janeiro Province in 1841, Paraná helped put down a rebellion headed by the opposition Liberal Party the following year. Also in 1842, he was elected senator for Minas Gerais and appointed by Pedro II to the Council of State. In 1843, he became the de facto first president (prime minister) of the Council of Ministers, but resigned after a quarrel with the emperor. (Full article...)
  • Image 3 Seacology is a nonprofit 501(c)(3) charitable organization headquartered in Berkeley, California, that works to preserve island ecosystems and cultures around the world. Founded in 1991, it began with the work of ethnobotanist Paul Alan Cox, who researched tropical plants and their medicinal value in the village of Falealupo in Samoa during the mid-1980s. When the villagers were pressured into selling logging rights to their rainforest in 1988 to build a new school, Cox and his wife offered to help secure funds for the new school in return for an agreement with the villagers to protect their forest. With the help of his friends and family, Cox secured the funds within six months, later earning him and the village chief, Fuiono Senio, the Goldman Environmental Prize for their efforts. Word spread throughout the islands, and with increasing demand for similar projects, Cox, along with Bill Marré and Ken Murdock, decided to form Seacology and expand their work internationally. For the first few years, the organization operated on a volunteer basis. Because of the high risk of extinction for island fauna and the decline in coral reef ecosystems, Seacology's primary focus is projects in which villagers sign contracts under which they agree to help protect either terrestrial or marine habitat for a specified time in return for new buildings or services. The operations are low-cost, averaging around US$20,000 to $25,000. Construction is done with local labor and sometimes without the use of machinery. Seacology selects its projects by reviewing the recommendations of its field representatives and its scientific advisory board. (Full article...)
    Seacology is a nonprofit 501(c)(3) charitable organization headquartered in Berkeley, California, that works to preserve island ecosystems and cultures around the world. Founded in 1991, it began with the work of ethnobotanist Paul Alan Cox, who researched tropical plants and their medicinal value in the village of Falealupo in Samoa during the mid-1980s. When the villagers were pressured into selling logging rights to their rainforest in 1988 to build a new school, Cox and his wife offered to help secure funds for the new school in return for an agreement with the villagers to protect their forest. With the help of his friends and family, Cox secured the funds within six months, later earning him and the village chief, Fuiono Senio, the Goldman Environmental Prize for their efforts. Word spread throughout the islands, and with increasing demand for similar projects, Cox, along with Bill Marré and Ken Murdock, decided to form Seacology and expand their work internationally. For the first few years, the organization operated on a volunteer basis.

    Because of the high risk of extinction for island fauna and the decline in coral reef ecosystems, Seacology's primary focus is projects in which villagers sign contracts under which they agree to help protect either terrestrial or marine habitat for a specified time in return for new buildings or services. The operations are low-cost, averaging around US$20,000 to $25,000. Construction is done with local labor and sometimes without the use of machinery. Seacology selects its projects by reviewing the recommendations of its field representatives and its scientific advisory board. (Full article...)
  • Image 4 Skegness clock tower and seafront amusements Skegness (/ˌskɛɡˈnɛs/ skeg-NESS) is a seaside town and civil parish in the East Lindsey District of Lincolnshire, England. On the Lincolnshire coast of the North Sea, the town is 43 miles (69 km) east of Lincoln and 22 miles (35 km) north-east of Boston. With a population of 21,128 as of 2021, it is the largest settlement in East Lindsey. It incorporates Winthorpe and Seacroft, and forms a larger built-up area with the resorts of Ingoldmells and Chapel St Leonards to the north. The town is on the A52 and A158 roads, connecting it with Boston and the East Midlands, and Lincoln respectively. Skegness railway station is on the Nottingham to Skegness (via Grantham) line. The original Skegness was situated farther east at the mouth of The Wash. Its Norse name refers to a headland which sat near the settlement. By the 14th century, it was a locally important port for coastal trade. The natural sea defences which protected the harbour eroded in the later Middle Ages, and it was lost to the sea after a storm in the 1520s. Rebuilt along the new shoreline, early modern Skegness was a small fishing and farming village, but from the late 18th century members of the local gentry visited for holidays. The arrival of the railways in 1873 transformed it into a popular seaside resort. This was the intention of The 9th Earl of Scarbrough, who owned most of the land in the vicinity; he built the infrastructure of the town and laid out plots, which he leased to speculative developers. This new Skegness quickly became a popular destination for holiday-makers and day trippers from the East Midlands factory towns. By the interwar years the town was established as one of the most popular seaside resorts in Britain. The layout of the modern seafront dates to this time and holiday camps were built around the town, including the first Butlin's holiday resort which opened in Ingoldmells in 1936. (Full article...)

    Skegness clock tower and seafront amusements

    Skegness (/ˌskɛɡˈnɛs/ skeg-NESS) is a seaside town and civil parish in the East Lindsey District of Lincolnshire, England. On the Lincolnshire coast of the North Sea, the town is 43 miles (69 km) east of Lincoln and 22 miles (35 km) north-east of Boston. With a population of 21,128 as of 2021, it is the largest settlement in East Lindsey. It incorporates Winthorpe and Seacroft, and forms a larger built-up area with the resorts of Ingoldmells and Chapel St Leonards to the north. The town is on the A52 and A158 roads, connecting it with Boston and the East Midlands, and Lincoln respectively. Skegness railway station is on the Nottingham to Skegness (via Grantham) line.

    The original Skegness was situated farther east at the mouth of The Wash. Its Norse name refers to a headland which sat near the settlement. By the 14th century, it was a locally important port for coastal trade. The natural sea defences which protected the harbour eroded in the later Middle Ages, and it was lost to the sea after a storm in the 1520s. Rebuilt along the new shoreline, early modern Skegness was a small fishing and farming village, but from the late 18th century members of the local gentry visited for holidays. The arrival of the railways in 1873 transformed it into a popular seaside resort. This was the intention of The 9th Earl of Scarbrough, who owned most of the land in the vicinity; he built the infrastructure of the town and laid out plots, which he leased to speculative developers. This new Skegness quickly became a popular destination for holiday-makers and day trippers from the East Midlands factory towns. By the interwar years the town was established as one of the most popular seaside resorts in Britain. The layout of the modern seafront dates to this time and holiday camps were built around the town, including the first Butlin's holiday resort which opened in Ingoldmells in 1936. (Full article...)
  • Image 5 Payún Matrú Payún Matrú is a shield volcano in the Reserva Provincial La Payunia of the Malargüe Department, south of the Mendoza Province in Argentina. It lies in the back-arc region of the Andean Volcanic Belt, and was formed by the subduction of the Nazca Plate beneath the South American Plate. Payún Matrú, along with the Llancanelo, Nevado and Salado Basin volcanic fields, form the Payenia province. It has been proposed as a World Heritage Site since 2011. Payún Matrú developed on sediment and volcanic rocks ageing from the Mesoproterozoic to the Tertiary periods. It consists of a large shield volcano capped by a caldera, formed during a major eruption between 168,000 and 82,000 years ago, a high compound volcano (known as Payun or Payun Liso), and two groups of scoria cones and lava flows. The Pleistocene Pampas Onduladas lava flow reaches a length of 167–181 km (104–112 mi) and is the world's longest Quaternary lava flow. (Full article...)

    Payún Matrú

    Payún Matrú is a shield volcano in the Reserva Provincial La Payunia of the Malargüe Department, south of the Mendoza Province in Argentina. It lies in the back-arc region of the Andean Volcanic Belt, and was formed by the subduction of the Nazca Plate beneath the South American Plate. Payún Matrú, along with the Llancanelo, Nevado and Salado Basin volcanic fields, form the Payenia province. It has been proposed as a World Heritage Site since 2011.

    Payún Matrú developed on sediment and volcanic rocks ageing from the Mesoproterozoic to the Tertiary periods. It consists of a large shield volcano capped by a caldera, formed during a major eruption between 168,000 and 82,000 years ago, a high compound volcano (known as Payun or Payun Liso), and two groups of scoria cones and lava flows. The Pleistocene Pampas Onduladas lava flow reaches a length of 167–181 km (104–112 mi) and is the world's longest Quaternary lava flow. (Full article...)
  • Image 6 The empire in 555 under Justinian I, its greatest extent since the fall of the Western Roman Empire, with vassals in pink The Byzantine Empire, also referred to as the Eastern Roman Empire, was the continuation of the Roman Empire centred in Constantinople during late antiquity and the Middle Ages. The eastern half of the Empire survived the conditions that caused the fall of the West in the 5th century AD, and continued to exist until the fall of Constantinople to the Ottoman Empire in 1453. During most of its existence, the empire remained the most powerful economic, cultural, and military force in the Mediterranean world. The term "Byzantine Empire" was only coined following the empire's demise; its citizens referred to the polity as the "Roman Empire" and to themselves as "Romans". Due to the imperial seat's move from Rome to Byzantium, the adoption of state Christianity, and the predominance of Greek instead of Latin, modern historians continue to make a distinction between the earlier Roman Empire and the later Byzantine Empire. During the earlier Pax Romana period, the western parts of the empire became increasingly Latinised, while the eastern parts largely retained their preexisting Hellenistic culture. This created a dichotomy between the Greek East and Latin West. These cultural spheres continued to diverge after Constantine I (r. 324–337) moved the capital to Constantinople and legalised Christianity. Under Theodosius I (r. 379–395), Christianity became the state religion, and other religious practices were proscribed. Greek gradually replaced Latin for official use as Latin fell into disuse. (Full article...)

    The empire in 555 under Justinian I, its greatest extent since the fall of the Western Roman Empire, with vassals in pink

    The Byzantine Empire, also referred to as the Eastern Roman Empire, was the continuation of the Roman Empire centred in Constantinople during late antiquity and the Middle Ages. The eastern half of the Empire survived the conditions that caused the fall of the West in the 5th century AD, and continued to exist until the fall of Constantinople to the Ottoman Empire in 1453. During most of its existence, the empire remained the most powerful economic, cultural, and military force in the Mediterranean world. The term "Byzantine Empire" was only coined following the empire's demise; its citizens referred to the polity as the "Roman Empire" and to themselves as "Romans". Due to the imperial seat's move from Rome to Byzantium, the adoption of state Christianity, and the predominance of Greek instead of Latin, modern historians continue to make a distinction between the earlier Roman Empire and the later Byzantine Empire.

    During the earlier Pax Romana period, the western parts of the empire became increasingly Latinised, while the eastern parts largely retained their preexisting Hellenistic culture. This created a dichotomy between the Greek East and Latin West. These cultural spheres continued to diverge after Constantine I (r. 324–337) moved the capital to Constantinople and legalised Christianity. Under Theodosius I (r. 379–395), Christianity became the state religion, and other religious practices were proscribed. Greek gradually replaced Latin for official use as Latin fell into disuse. (Full article...)
  • Image 7 Lake Burley Griffin viewed from Black Mountain Tower Lake Burley Griffin is an artificial lake in the centre of Canberra, the capital of Australia. It was completed in 1963 after the Molonglo River, which ran between the city centre and Parliamentary Triangle, was dammed. It is named after Walter Burley Griffin, the architect who won the competition to design the city of Canberra. Griffin designed the lake with many geometric motifs, so that the axes of his design lined up with natural geographical landmarks in the area. However, government authorities changed his original plans, and no substantial work was completed on the lake before he left the project in 1920. Griffin's proposal was further delayed by the Great Depression and World War II, and it was not until the 1950s that planning resumed. After political disputes and consideration of other proposed variations, excavation work began in 1960 with the energetic backing of Australian Prime Minister Robert Menzies. After the completion of the bridges and dams, the dams were locked in September 1963. However, because of a drought, the lake's target water level was not reached until April 1964. The lake was formally inaugurated on 17 October 1964. (Full article...)

    Lake Burley Griffin
    viewed from Black Mountain Tower

    Lake Burley Griffin is an artificial lake in the centre of Canberra, the capital of Australia. It was completed in 1963 after the Molonglo River, which ran between the city centre and Parliamentary Triangle, was dammed. It is named after Walter Burley Griffin, the architect who won the competition to design the city of Canberra.

    Griffin designed the lake with many geometric motifs, so that the axes of his design lined up with natural geographical landmarks in the area. However, government authorities changed his original plans, and no substantial work was completed on the lake before he left the project in 1920. Griffin's proposal was further delayed by the Great Depression and World War II, and it was not until the 1950s that planning resumed. After political disputes and consideration of other proposed variations, excavation work began in 1960 with the energetic backing of Australian Prime Minister Robert Menzies. After the completion of the bridges and dams, the dams were locked in September 1963. However, because of a drought, the lake's target water level was not reached until April 1964. The lake was formally inaugurated on 17 October 1964. (Full article...)
  • Image 8 Clockwise from top left: Grey seal (Halichoerus grypus), Steller sea lion (Eumetopias jubatus), New Zealand fur seal (Arctocephalus forsteri), walrus (Odobenus rosmarus), and southern elephant seal (Mirounga leonina) Pinnipeds (pronounced /ˈpɪnɪˌpɛdz/), commonly known as seals, are a widely distributed and diverse clade of carnivorous, fin-footed, semiaquatic, mostly marine mammals. They comprise the extant families Odobenidae (whose only living member is the walrus), Otariidae (the eared seals: sea lions and fur seals), and Phocidae (the earless seals, or true seals), with 34 extant species and more than 50 extinct species described from fossils. While seals were historically thought to have descended from two ancestral lines, molecular evidence supports them as a monophyletic group (descended from one ancestor). Pinnipeds belong to the suborder Caniformia of the order Carnivora; their closest living relatives are musteloids (weasels, raccoons, skunks and red pandas), having diverged about 50 million years ago. Seals range in size from the 1 m (3 ft 3 in) and 45 kg (100 lb) Baikal seal to the 5 m (16 ft) and 3,200 kg (7,100 lb) southern elephant seal. Several species exhibit sexual dimorphism. They have streamlined bodies and four limbs that are modified into flippers. Though not as fast in the water as dolphins, seals are more flexible and agile. Otariids primarily use their front limbs to propel themselves through the water, while phocids and walruses primarily use their hind limbs for this purpose. Otariids and walruses have hind limbs that can be pulled under the body and used as legs on land. By comparison, terrestrial locomotion by phocids is more cumbersome. Otariids have visible external ears, while phocids and walruses lack these. Pinnipeds have well-developed senses—their eyesight and hearing are adapted for both air and water, and they have an advanced tactile system in their whiskers or vibrissae. Some species are well adapted for diving to great depths. They have a layer of fat, or blubber, under the skin to keep warm in cold water, and, other than the walrus, all species are covered in fur. (Full article...)

    Clockwise from top left: Grey seal (Halichoerus grypus), Steller sea lion (Eumetopias jubatus), New Zealand fur seal (Arctocephalus forsteri), walrus (Odobenus rosmarus), and southern elephant seal (Mirounga leonina)

    Pinnipeds (pronounced /ˈpɪnɪˌpɛdz/), commonly known as seals, are a widely distributed and diverse clade of carnivorous, fin-footed, semiaquatic, mostly marine mammals. They comprise the extant families Odobenidae (whose only living member is the walrus), Otariidae (the eared seals: sea lions and fur seals), and Phocidae (the earless seals, or true seals), with 34 extant species and more than 50 extinct species described from fossils. While seals were historically thought to have descended from two ancestral lines, molecular evidence supports them as a monophyletic group (descended from one ancestor). Pinnipeds belong to the suborder Caniformia of the order Carnivora; their closest living relatives are musteloids (weasels, raccoons, skunks and red pandas), having diverged about 50 million years ago.

    Seals range in size from the 1 m (3 ft 3 in) and 45 kg (100 lb) Baikal seal to the 5 m (16 ft) and 3,200 kg (7,100 lb) southern elephant seal. Several species exhibit sexual dimorphism. They have streamlined bodies and four limbs that are modified into flippers. Though not as fast in the water as dolphins, seals are more flexible and agile. Otariids primarily use their front limbs to propel themselves through the water, while phocids and walruses primarily use their hind limbs for this purpose. Otariids and walruses have hind limbs that can be pulled under the body and used as legs on land. By comparison, terrestrial locomotion by phocids is more cumbersome. Otariids have visible external ears, while phocids and walruses lack these. Pinnipeds have well-developed senses—their eyesight and hearing are adapted for both air and water, and they have an advanced tactile system in their whiskers or vibrissae. Some species are well adapted for diving to great depths. They have a layer of fat, or blubber, under the skin to keep warm in cold water, and, other than the walrus, all species are covered in fur. (Full article...)
  • Image 9 Prussian grenadiers advancing at the Battle of Leuthen, as depicted by Carl Röchling The Third Silesian War (German: Dritter Schlesischer Krieg) was a war between Prussia and Austria (together with its allies) that lasted from 1756 to 1763 and confirmed Prussia's control of the region of Silesia (now in south-western Poland). The war was fought mainly in Silesia, Bohemia and Upper Saxony and formed one theatre of the Seven Years' War. It was the last of three Silesian Wars fought between Frederick the Great's Prussia and Maria Theresa's Austria in the mid-18th century, all three of which ended in Prussian control of Silesia. This conflict can be viewed as a continuation of the First and Second Silesian Wars of the previous decade. After the Treaty of Aix-la-Chapelle ended the War of the Austrian Succession, Austria enacted broad reforms and upended its traditional diplomatic policy to prepare for renewed war with Prussia. As with the previous Silesian Wars, no particular triggering event initiated the conflict; rather, Prussia struck opportunistically to disrupt its enemies' plans. The war's cost in blood and treasure was high on both sides, and it ended inconclusively when neither of the main belligerents could sustain the conflict any longer. (Full article...)

    Prussian grenadiers advancing at the Battle of Leuthen, as depicted by Carl Röchling

    The Third Silesian War (German: Dritter Schlesischer Krieg) was a war between Prussia and Austria (together with its allies) that lasted from 1756 to 1763 and confirmed Prussia's control of the region of Silesia (now in south-western Poland). The war was fought mainly in Silesia, Bohemia and Upper Saxony and formed one theatre of the Seven Years' War. It was the last of three Silesian Wars fought between Frederick the Great's Prussia and Maria Theresa's Austria in the mid-18th century, all three of which ended in Prussian control of Silesia.

    This conflict can be viewed as a continuation of the First and Second Silesian Wars of the previous decade. After the Treaty of Aix-la-Chapelle ended the War of the Austrian Succession, Austria enacted broad reforms and upended its traditional diplomatic policy to prepare for renewed war with Prussia. As with the previous Silesian Wars, no particular triggering event initiated the conflict; rather, Prussia struck opportunistically to disrupt its enemies' plans. The war's cost in blood and treasure was high on both sides, and it ended inconclusively when neither of the main belligerents could sustain the conflict any longer. (Full article...)
  • Image 10 View inside the caldera Incapillo is a Pleistocene-age caldera (a depression formed by the collapse of a volcano) in the La Rioja Province of Argentina. It is the southernmost volcanic centre in the Andean Central Volcanic Zone (CVZ) that erupted during the Pleistocene. Incapillo is one of several ignimbrite or caldera systems that, along with 44 active stratovolcanoes, comprise the CVZ. Subduction of the Nazca Plate beneath the South American Plate is responsible for most of the volcanism in the CVZ. After activity in the volcanic arc of the western Maricunga Belt ceased six million years ago, volcanism commenced in the Incapillo region, forming the high volcanic edifices Monte Pissis, Cerro Bonete Chico and Sierra de Veladero. Later, a number of lava domes were emplaced between these volcanoes. (Full article...)

    View inside the caldera

    Incapillo is a Pleistocene-age caldera (a depression formed by the collapse of a volcano) in the La Rioja Province of Argentina. It is the southernmost volcanic centre in the Andean Central Volcanic Zone (CVZ) that erupted during the Pleistocene. Incapillo is one of several ignimbrite or caldera systems that, along with 44 active stratovolcanoes, comprise the CVZ.

    Subduction of the Nazca Plate beneath the South American Plate is responsible for most of the volcanism in the CVZ. After activity in the volcanic arc of the western Maricunga Belt ceased six million years ago, volcanism commenced in the Incapillo region, forming the high volcanic edifices Monte Pissis, Cerro Bonete Chico and Sierra de Veladero. Later, a number of lava domes were emplaced between these volcanoes. (Full article...)
  • Image 11 A view of the MCVF, with Mount Cayley obscured by clouds on the left. Mount Fee is the relatively small jagged peak to the far right. The Mount Cayley volcanic field (MCVF) is a remote volcanic zone on the South Coast of British Columbia, Canada, stretching 31 km (19 mi) from the Pemberton Icefield to the Squamish River. It forms a segment of the Garibaldi Volcanic Belt, the Canadian portion of the Cascade Volcanic Arc, which extends from Northern California to southwestern British Columbia. Most of the MCVF volcanoes were formed during periods of volcanism under sheets of glacial ice throughout the last glacial period. These subglacial eruptions formed steep, flat-topped volcanoes and subglacial lava domes, most of which have been entirely exposed by deglaciation. However, at least two volcanoes predate the last glacial period and both are highly eroded. The field gets its name from Mount Cayley, a volcanic peak located at the southern end of the Powder Mountain Icefield. This icefield covers much of the central portion of the volcanic field and is one of the several glacial fields in the Pacific Ranges of the Coast Mountains. Eruptions along the length of the MCVF began between 1.6 and 5.3 million years ago. At least 23 eruptions have occurred throughout its eruptive history. This volcanic activity ranged from effusive to explosive, with magma compositions ranging from basaltic to rhyolitic. Because the MCVF has a high elevation and consists of a cluster of mostly high altitude, non-overlapping volcanoes, subglacial activity is likely to have occurred under less than 800 m (2,600 ft) of glacial ice. The style of this glaciation promoted meltwater escape during eruptions. The steep profile of the volcanic field and its subglacial landforms support this hypothesis. As a result, volcanic features in the MCVF that interacted with glacial ice lack rocks that display evidence of abundant water during eruption, such as hyaloclastite and pillow lava. (Full article...)

    A view of the MCVF, with Mount Cayley obscured by clouds on the left. Mount Fee is the relatively small jagged peak to the far right.

    The Mount Cayley volcanic field (MCVF) is a remote volcanic zone on the South Coast of British Columbia, Canada, stretching 31 km (19 mi) from the Pemberton Icefield to the Squamish River. It forms a segment of the Garibaldi Volcanic Belt, the Canadian portion of the Cascade Volcanic Arc, which extends from Northern California to southwestern British Columbia. Most of the MCVF volcanoes were formed during periods of volcanism under sheets of glacial ice throughout the last glacial period. These subglacial eruptions formed steep, flat-topped volcanoes and subglacial lava domes, most of which have been entirely exposed by deglaciation. However, at least two volcanoes predate the last glacial period and both are highly eroded. The field gets its name from Mount Cayley, a volcanic peak located at the southern end of the Powder Mountain Icefield. This icefield covers much of the central portion of the volcanic field and is one of the several glacial fields in the Pacific Ranges of the Coast Mountains.

    Eruptions along the length of the MCVF began between 1.6 and 5.3 million years ago. At least 23 eruptions have occurred throughout its eruptive history. This volcanic activity ranged from effusive to explosive, with magma compositions ranging from basaltic to rhyolitic. Because the MCVF has a high elevation and consists of a cluster of mostly high altitude, non-overlapping volcanoes, subglacial activity is likely to have occurred under less than 800 m (2,600 ft) of glacial ice. The style of this glaciation promoted meltwater escape during eruptions. The steep profile of the volcanic field and its subglacial landforms support this hypothesis. As a result, volcanic features in the MCVF that interacted with glacial ice lack rocks that display evidence of abundant water during eruption, such as hyaloclastite and pillow lava. (Full article...)
  • Image 12 Waves breaking on the Doom Bar at high water The Doom Bar (previously known as Dunbar sands, Dune-bar, and similar names) is a sandbar at the mouth of the estuary of the River Camel, where it meets the Atlantic Ocean on the north coast of Cornwall, England. Like two other permanent sandbanks further up the estuary, the Doom Bar is composed mainly of marine sand that is continually being carried up from the seabed. More than 60 percent of the sand is derived from marine shells, making it an important source of agricultural lime, which has been collected for hundreds of years; an estimated 10 million tons of sand or more has been removed from the estuary since the early nineteenth century, mainly by dredging. The estuary mouth, exposed to the Atlantic Ocean, is a highly dynamic environment, and the sands have been prone to dramatic shifts during storms. According to tradition, the Doom Bar formed in the reign of Henry VIII, damaging the prosperity of the port of Padstow a mile up the estuary. (Full article...)

    Waves breaking on the Doom Bar at high water

    The Doom Bar (previously known as Dunbar sands, Dune-bar, and similar names) is a sandbar at the mouth of the estuary of the River Camel, where it meets the Atlantic Ocean on the north coast of Cornwall, England. Like two other permanent sandbanks further up the estuary, the Doom Bar is composed mainly of marine sand that is continually being carried up from the seabed. More than 60 percent of the sand is derived from marine shells, making it an important source of agricultural lime, which has been collected for hundreds of years; an estimated 10 million tons of sand or more has been removed from the estuary since the early nineteenth century, mainly by dredging.

    The estuary mouth, exposed to the Atlantic Ocean, is a highly dynamic environment, and the sands have been prone to dramatic shifts during storms. According to tradition, the Doom Bar formed in the reign of Henry VIII, damaging the prosperity of the port of Padstow a mile up the estuary. (Full article...)
  • Image 13 View of Ambohimanga Ambohimanga is a hill and traditional fortified royal settlement (rova) in Madagascar, located approximately 24 kilometers (15 mi) northeast of the capital city of Antananarivo. It is situated in the commune of Ambohimanga Rova. The hill and the rova that stands on top are considered the most significant symbol of the cultural identity of the Merina people and the most important and best-preserved monument of the precolonial Merina Kingdom. The walled historic village includes residences and burial sites of several key monarchs. The site, one of the twelve sacred hills of Imerina, is associated with strong feelings of national identity and has maintained its spiritual and sacred character both in ritual practice and the popular imagination for at least four hundred years. It remains a place of worship to which pilgrims come from Madagascar and elsewhere. (Full article...)

    View of Ambohimanga

    Ambohimanga is a hill and traditional fortified royal settlement (rova) in Madagascar, located approximately 24 kilometers (15 mi) northeast of the capital city of Antananarivo. It is situated in the commune of Ambohimanga Rova.

    The hill and the rova that stands on top are considered the most significant symbol of the cultural identity of the Merina people and the most important and best-preserved monument of the precolonial Merina Kingdom. The walled historic village includes residences and burial sites of several key monarchs. The site, one of the twelve sacred hills of Imerina, is associated with strong feelings of national identity and has maintained its spiritual and sacred character both in ritual practice and the popular imagination for at least four hundred years. It remains a place of worship to which pilgrims come from Madagascar and elsewhere. (Full article...)
  • Image 14 Truman near his lodge in 1980, a few months before his death Harry R. Truman (October 1896 – May 18, 1980) was an American businessman, bootlegger, and prospector. He lived near Mount St. Helens, an active volcano in the state of Washington, and was the owner and caretaker of Mount St. Helens Lodge at Spirit Lake near the base of the mountain. Truman came to fame as a folk hero in the weeks leading up to the volcano's 1980 eruption after refusing to leave his home despite evacuation orders. He was killed by a pyroclastic flow that overtook his lodge and buried the site under 150 ft (46 m) of volcanic debris. After Truman's death, his family and friends reflected on his love for the mountain. In 1981, Art Carney portrayed Truman in the docudrama film St. Helens. He was commemorated in a book by his niece, and also in various pieces of music, including songs by Headgear, Billy Jonas, and Shawn Wright and the Brothers Band. (Full article...)

    Truman near his lodge in 1980, a few months before his death

    Harry R. Truman (October 1896 – May 18, 1980) was an American businessman, bootlegger, and prospector. He
    lived near Mount St. Helens, an active volcano in the state of Washington, and was the owner and caretaker of Mount St. Helens Lodge at Spirit Lake near the base of the mountain. Truman came to fame as a folk hero in the weeks leading up to the volcano's 1980 eruption after refusing to leave his home despite evacuation orders. He was killed by a pyroclastic flow that overtook his lodge and buried the site under 150 ft (46 m) of volcanic debris.

    After Truman's death, his family and friends reflected on his love for the mountain. In 1981, Art Carney portrayed Truman in the docudrama film St. Helens. He was commemorated in a book by his niece, and also in various pieces of music, including songs by Headgear, Billy Jonas, and Shawn Wright and the Brothers Band. (Full article...)
  • Image 15 The Socialist Soviet Republic of Abkhazia (SSR Abkhazia) was a short-lived republic within the Caucasus region of the Soviet Union that covered the territory of Abkhazia, and existed from 31 March 1921 to 19 February 1931. Formed in the aftermath of the Red Army invasion of Georgia in 1921, it was independent until 16 December 1921 when it agreed to a treaty that united it with the Georgian Soviet Socialist Republic (Georgian SSR). The SSR Abkhazia was similar to an autonomous Soviet republic, though it retained nominal independence from Georgia and was given certain features only full union republics had, like its own military units. Through its status as a "treaty republic" with Georgia, Abkhazia joined the Transcaucasian Soviet Federative Socialist Republic, which united Armenian, Azerbaijani, and Georgian SSRs into one federal unit when the latter was formed in 1922. The SSR Abkhazia was abolished in 1931 and replaced with the Abkhaz Autonomous Soviet Socialist Republic within the Georgian SSR. During its existence, the SSR Abkhazia was led by Nestor Lakoba, who served officially as the Chairman of the Council of People's Commissars but controlled the republic to such an extent that it was jokingly referred to as "Lakobistan". Due to Lakoba's close relationship with Soviet leader Joseph Stalin, collectivisation was delayed until after Abkhazia was incorporated into Georgia. Abkhazia remained a major tobacco producer in this era, growing over half of the USSR's supply. It also produced other agricultural produce, including tea, wine, and citrus fruits, leading to Abkhazia being one of the wealthiest regions in the Soviet Union. Its sub-tropical climate also made it a prime holiday destination, with Stalin and other Soviet leaders owning dachas (holiday homes) in the region and spending considerable time there. (Full article...)

    The Socialist Soviet Republic of Abkhazia (SSR Abkhazia) was a short-lived republic within the Caucasus region of the Soviet Union that covered the territory of Abkhazia, and existed from 31 March 1921 to 19 February 1931. Formed in the aftermath of the Red Army invasion of Georgia in 1921, it was independent until 16 December 1921 when it agreed to a treaty that united it with the Georgian Soviet Socialist Republic (Georgian SSR). The SSR Abkhazia was similar to an autonomous Soviet republic, though it retained nominal independence from Georgia and was given certain features only full union republics had, like its own military units. Through its status as a "treaty republic" with Georgia, Abkhazia joined the Transcaucasian Soviet Federative Socialist Republic, which united Armenian, Azerbaijani, and Georgian SSRs into one federal unit when the latter was formed in 1922. The SSR Abkhazia was abolished in 1931 and replaced with the Abkhaz Autonomous Soviet Socialist Republic within the Georgian SSR.

    During its existence, the SSR Abkhazia was led by Nestor Lakoba, who served officially as the Chairman of the Council of People's Commissars but controlled the republic to such an extent that it was jokingly referred to as "Lakobistan". Due to Lakoba's close relationship with Soviet leader Joseph Stalin, collectivisation was delayed until after Abkhazia was incorporated into Georgia. Abkhazia remained a major tobacco producer in this era, growing over half of the USSR's supply. It also produced other agricultural produce, including tea, wine, and citrus fruits, leading to Abkhazia being one of the wealthiest regions in the Soviet Union. Its sub-tropical climate also made it a prime holiday destination, with Stalin and other Soviet leaders owning dachas (holiday homes) in the region and spending considerable time there. (Full article...)
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North America is a continent in the Northern and Western Hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Caribbean Sea, and to the west and south by the Pacific Ocean. The region includes the Bahamas, Bermuda, Canada, the Caribbean, Central America, Clipperton Island, Greenland, Mexico, Saint Pierre and Miquelon, Turks and Caicos Islands, and the United States. (Full article...)

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Bust of Shen at the Beijing Ancient Observatory

Shen Kuo (Chinese: 沈括; 1031–1095) or Shen Gua, courtesy name Cunzhong (存中) and pseudonym Mengqi (now usually given as Mengxi) Weng (夢溪翁), was a Chinese polymath, scientist, and statesman of the Song dynasty (960–1279). Shen was a master in many fields of study including mathematics, optics, and horology. In his career as a civil servant, he became a finance minister, governmental state inspector, head official for the Bureau of Astronomy in the Song court, Assistant Minister of Imperial Hospitality, and also served as an academic chancellor. At court his political allegiance was to the Reformist faction known as the New Policies Group, headed by Chancellor Wang Anshi (1021–1085).

In his Dream Pool Essays or Dream Torrent Essays (夢溪筆談; Mengxi Bitan) of 1088, Shen was the first to describe the magnetic needle compass, which would be used for navigation (first described in Europe by Alexander Neckam in 1187). Shen discovered the concept of true north in terms of magnetic declination towards the north pole, with experimentation of suspended magnetic needles and "the improved meridian determined by Shen's [astronomical] measurement of the distance between the pole star and true north". This was the decisive step in human history to make compasses more useful for navigation, and may have been a concept unknown in Europe for another four hundred years (evidence of German sundials made circa 1450 show markings similar to Chinese geomancers' compasses in regard to declination). (Full article...)

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