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{
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"Introduction": {
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"Background": {
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"text": "A large body of recent oceanographic research has shown that the Antarctic Circumpolar Current (ACC), an ocean current that flows from west to east around Antarctica, plays a crucial role in global ocean circulation. The region where the cold waters of the ACC meet and mingle with the warmer waters of the north defines a distinct border - the Antarctic Convergence - which fluctuates with the seasons, but which encompasses a discrete body of water and a unique ecologic region. The Convergence concentrates nutrients, which promotes marine plant life, and which, in turn, allows for a greater abundance of animal life. In 2000, the International Hydrographic Organization delimited the waters within the Convergence as a fifth world ocean - the Southern Ocean - by combining the southern portions of the Atlantic Ocean, Indian Ocean, and Pacific Ocean. The Southern Ocean extends from the coast of Antarctica north to 60 degrees south latitude, which coincides with the Antarctic Treaty Limit and which approximates the extent of the Antarctic Convergence. As such, the Southern Ocean is now the fourth largest of the world's five oceans (after the Pacific Ocean, Atlantic Ocean, and Indian Ocean, but larger than the Arctic Ocean). It should be noted that inclusion of the Southern Ocean does not imply recognition of this feature as one of the world's primary oceans by the US Government."
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"text": "A large body of recent oceanographic research has shown that the Antarctic Circumpolar Current (ACC), an ocean current that flows from west to east around Antarctica, plays a crucial role in global ocean circulation. The region where the cold waters of the ACC meet and mingle with the warmer waters of the north defines a distinct border - the Antarctic Convergence - which fluctuates with the seasons, but which encompasses a discrete body of water and a unique ecologic region. The Convergence concentrates nutrients, which promotes marine plant life, and which, in turn, allows for a greater abundance of animal life. In 2000, the International Hydrographic Organization delimited the waters within the Convergence as a fifth world ocean - the Southern Ocean - by combining the southern portions of the Atlantic Ocean, Indian Ocean, and Pacific Ocean. The Southern Ocean extends from the coast of Antarctica north to 60 degrees south latitude, which coincides with the Antarctic Treaty region and which approximates the extent of the Antarctic Convergence. As such, the Southern Ocean is now the fourth largest of the world's five oceans (after the Pacific Ocean, Atlantic Ocean, and Indian Ocean, but larger than the Arctic Ocean). It should be noted that inclusion of the Southern Ocean does not imply recognition of this feature as one of the world's primary oceans by the US Government."
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}
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},
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"Geography": {
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"Terrain": {
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"text": "the Southern Ocean is 4,000 to 5,000-m deep over most of its extent with only limited areas of shallow water; the Antarctic continental shelf is generally narrow and unusually deep, its edge lying at depths of 400 to 800 m (the global mean is 133 m); the Antarctic icepack grows from an average minimum of 2.6 million sq km in March to about 18.8 million sq km in September, better than a sixfold increase in area; the Antarctic Circumpolar Current (21,000 km long) moves perpetually eastward, the world's largest ocean current, it transports 130 million cubic meters of water per second - 100 times the flow of all the world's rivers"
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},
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"Elevation extremes": {
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"lowest point": {
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"text": "southern end of the South Sandwich Trench -7,235 m"
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"Elevation": {
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"mean depth": {
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"text": "-3,270 m"
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},
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"highest point": {
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"text": "sea level 0 m"
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"elevation extremes": {
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"text": "lowest point: southern end of the South Sandwich Trench -7,235 m ++ highest point: sea level 0 m"
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}
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},
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"Natural resources": {
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"text": "probable large and possible giant oil and gas fields on the continental margin; manganese nodules, possible placer deposits, sand and gravel, fresh water as icebergs; squid, whales, and seals - none exploited; krill, fish"
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"text": "probable large oil and gas fields on the continental margin; manganese nodules, possible placer deposits, sand and gravel, fresh water as icebergs; squid, whales, and seals - none exploited; krill, fish"
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},
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"Natural hazards": {
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"text": "huge icebergs with drafts up to several hundred meters; smaller bergs and iceberg fragments; sea ice (generally 0.5 to 1 m thick) with sometimes dynamic short-term variations and with large annual and interannual variations; deep continental shelf floored by glacial deposits varying widely over short distances; high winds and large waves much of the year; ship icing, especially May-October; most of region is remote from sources of search and rescue"
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},
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"Environment - current issues": {
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"text": "increased solar ultraviolet radiation resulting from the Antarctic ozone hole in recent years, reducing marine primary productivity (phytoplankton), damaging the DNA of some fish, and causing sun damage to some mammals; large amount of mortality of seabirds resulting from long-line fishing for toothfish",
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"text": "increased solar ultraviolet radiation resulting from the Antarctic ozone hole in recent years, reducing marine primary productivity (phytoplankton), damaging the DNA of some fish, and causing sun damage to some mammals; large amount of mortality of seabirds resulting from long-line fishing for toothfish; ocean acidification",
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"note": {
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"text": "the now-protected fur seal population is making a strong comeback after severe overexploitation in the 18th and 19th centuries"
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}
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"text": "the major chokepoint is the Drake Passage between South America and Antarctica; the Polar Front (Antarctic Convergence) is the best natural definition of the northern extent of the Southern Ocean; it is a distinct region at the middle of the Antarctic Circumpolar Current that separates the cold polar surface waters to the south from the warmer waters to the north; the Front and the Current extend entirely around Antarctica, reaching south of 60 degrees south near New Zealand and near 48 degrees south in the far South Atlantic coinciding with the path of the maximum westerly winds"
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}
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},
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"Government": {
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"Country name": {
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"etymology": {
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"text": "the International Hydrographic Organization (IHO) included the ocean and its definition as the waters south of 60 degrees south in its year 2000 revision, but this has not formally been adopted; the 2000 IHO definition, however, was circulated in a draft edition in 2002 and has acquired de facto usage by many nations and organizations, including the CIA"
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}
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}
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},
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"Economy": {
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"Economy - overview": {
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"text": "Fisheries in 2006-07 landed 126,976 metric tons, of which 82% (104,586 tons) was krill (Euphausia superba) and 9.5% (12,027 tons) Patagonian toothfish (also known as Chilean sea bass), compared to 127,910 tons in 2005-06 of which 83% (106,591 tons) was krill and 9.7% (12,396 tons) Patagonian toothfish (estimated fishing from the area covered by the Convention of the Conservation of Antarctic Marine Living Resources (CCAMLR), which extends slightly beyond the Southern Ocean area). International agreements were adopted in late 1999 to reduce illegal, unreported, and unregulated fishing, which in the 2000-01 season landed, by one estimate, 8,376 metric tons of Patagonian and Antarctic toothfish. In the 2007-08 Antarctic summer, 45,213 tourists visited the Southern Ocean, compared to 35,552 in 2006-07, and 29,799 in 2005-06 (estimates provided to the Antarctic Treaty by the International Association of Antarctica Tour Operators (IAATO), and does not include passengers on overflights and those flying directly in and out of Antarctica)."
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"text": "Fisheries in 2013-14 landed 302,960 metric tons, of which 96% (291,370 tons-the highest reported catch since 1991) was krill and 4% (11,590 tons) Patagonian toothfish (also known as Chilean sea bass), compared to 15,330 tons in 2012-13 (estimated fishing from the area covered by the Convention of the Conservation of Antarctic Marine Living Resources, which extends slightly beyond the Southern Ocean area). International agreements were adopted in late 1999 to reduce illegal, unreported, and unregulated fishing, which in the 2000-01 season landed, by one estimate, 8,376 metric tons of Patagonian and Antarctic toothfish. In the 2014-15 Antarctic summer, 36,702 tourists visited the Southern Ocean, slightly lower than the 37,405 visitors in 2013-14 (estimates provided to the Antarctic Treaty by the International Association of Antarctica Tour Operators, and does not include passengers on overflights and those flying directly in and out of Antarctica)."
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}
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},
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"Transportation": {
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},
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"Transnational Issues": {
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"Disputes - international": {
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"text": "Antarctic Treaty defers claims (see Antarctica entry), but Argentina, Australia, Chile, France, NZ, Norway, and UK assert claims (some overlapping), including the continental shelf in the Southern Ocean; several states have expressed an interest in extending those continental shelf claims under the United Nations Convention on the Law of the Sea to include undersea ridges; the US and most other states do not recognize the land or maritime claims of other states and have made no claims themselves (the US and Russia have reserved the right to do so); no formal claims exist in the waters in the sector between 90 degrees west and 150 degrees west"
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"text": "Antarctic Treaty defers claims (see Antarctica entry), but Argentina, Australia, Chile, France, NZ, Norway, and UK assert claims (some overlapping), including the continental shelf in the Southern Ocean; several states have expressed an interest in extending those continental shelf claims under the UN Convention on the Law of the Sea to include undersea ridges; the US and most other states do not recognize the land or maritime claims of other states and have made no claims themselves (the US and Russia have reserved the right to do so); no formal claims exist in the waters in the sector between 90 degrees west and 150 degrees west"
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}
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}
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}
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}
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},
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"Area - comparative": {
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"text": "about 5.5 times the size of the US"
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"text": "almost 7 times the size of the US"
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},
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"Coastline": {
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"text": "66,526 km"
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"Terrain": {
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"text": "surface dominated by counterclockwise gyre (broad, circular system of currents) in the southern Indian Ocean; unique reversal of surface currents in the northern Indian Ocean; low atmospheric pressure over southwest Asia from hot, rising, summer air results in the southwest monsoon and southwest-to-northeast winds and currents, while high pressure over northern Asia from cold, falling, winter air results in the northeast monsoon and northeast-to-southwest winds and currents; ocean floor is dominated by the Mid-Indian Ocean Ridge and subdivided by the Southeast Indian Ocean Ridge, Southwest Indian Ocean Ridge, and Ninetyeast Ridge"
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},
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"Elevation extremes": {
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"lowest point": {
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"text": "Java Trench -7,258 m"
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"Elevation": {
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"mean depth": {
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"text": "-3,741 m"
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},
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"highest point": {
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"text": "sea level 0 m"
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"elevation extremes": {
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"text": "lowest point: Java Trench -7,258 m ++ highest point: sea level 0 m"
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}
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},
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"Natural resources": {
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"text": "major chokepoints include Bab el Mandeb, Strait of Hormuz, Strait of Malacca, southern access to the Suez Canal, and the Lombok Strait"
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}
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},
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"Government": {
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"Country name": {
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"etymology": {
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"text": "named for the country of India, which makes up much of its northern border"
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}
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}
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},
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"Economy": {
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"Economy - overview": {
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"text": "The Indian Ocean provides major sea routes connecting the Middle East, Africa, and East Asia with Europe and the Americas. It carries a particularly heavy traffic of petroleum and petroleum products from the oilfields of the Persian Gulf and Indonesia. Its fish are of great and growing importance to the bordering countries for domestic consumption and export. Fishing fleets from Russia, Japan, South Korea, and Taiwan also exploit the Indian Ocean, mainly for shrimp and tuna. Large reserves of hydrocarbons are being tapped in the offshore areas of Saudi Arabia, Iran, India, and western Australia. An estimated 40% of the world's offshore oil production comes from the Indian Ocean. Beach sands rich in heavy minerals and offshore placer deposits are actively exploited by bordering countries, particularly India, South Africa, Indonesia, Sri Lanka, and Thailand."
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{
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"Introduction": {
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"Background": {
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"text": "The Arctic Ocean is the smallest of the world's five oceans (after the Pacific Ocean, Atlantic Ocean, Indian Ocean, and the Southern Ocean). The Northwest Passage (US and Canada) and Northern Sea Route (Norway and Russia) are two important seasonal waterways. In recent years the polar ice pack has receded in the summer allowing for increased navigation and raising the possibility of future sovereignty and shipping disputes among countries bordering the Arctic Ocean."
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"text": "The Arctic Ocean is the smallest of the world's five oceans (after the Pacific Ocean, Atlantic Ocean, Indian Ocean, and the Southern Ocean). The Northwest Passage (US and Canada) and Northern Sea Route (Norway and Russia) are two important seasonal waterways. In recent years the polar ice pack has receded in the summer allowing for increased navigation and raising the possibility of future sovereignty and shipping disputes among the six countries bordering the Arctic Ocean (Canada, Denmark (Greenland), Iceland, Norway, Russia, US)."
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}
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},
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"Geography": {
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"Terrain": {
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"text": "central surface covered by a perennial drifting polar icepack that, on average, is about 3 m thick, although pressure ridges may be three times that thickness; clockwise drift pattern in the Beaufort Gyral Stream, but nearly straight-line movement from the New Siberian Islands (Russia) to Denmark Strait (between Greenland and Iceland); the icepack is surrounded by open seas during the summer, but more than doubles in size during the winter and extends to the encircling landmasses; the ocean floor is about 50% continental shelf (highest percentage of any ocean) with the remainder a central basin interrupted by three submarine ridges (Alpha Cordillera, Nansen Cordillera, and Lomonosov Ridge)"
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},
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"Elevation extremes": {
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"lowest point": {
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"text": "Fram Basin -4,665 m"
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"Elevation": {
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"mean depth": {
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"text": "-1,205 m"
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},
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"highest point": {
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"text": "sea level 0 m"
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"elevation extremes": {
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"text": "lowest point: Molloy Deep -5,607 m ++ highest point: sea level 0 m"
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}
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},
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"Natural resources": {
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"text": "major chokepoint is the southern Chukchi Sea (northern access to the Pacific Ocean via the Bering Strait); strategic location between North America and Russia; shortest marine link between the extremes of eastern and western Russia; floating research stations operated by the US and Russia; maximum snow cover in March or April about 20 to 50 centimeters over the frozen ocean; snow cover lasts about 10 months"
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}
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},
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"Government": {
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"Country name": {
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"etymology": {
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"text": "the name Arctic comes from the Greek word \"arktikos\" meaning \"near the bear\" or \"northern,\" and that word derives from \"arktos,\" meaning \"bear\"; the name refers either to the constellation Ursa Major, the \"Great Bear,\" which is prominent in the northern celestial sphere, or to the constellation Ursa Minor, the \"Little Bear,\" which contains Polaris, the North (Pole) Star"
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}
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}
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},
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"Economy": {
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"Economy - overview": {
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"text": "Economic activity is limited to the exploitation of natural resources, including petroleum, natural gas, fish, and seals."
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},
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"Transnational Issues": {
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"Disputes - international": {
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"text": "Canada and the United States dispute how to divide the Beaufort Sea and the status of the Northwest Passage but continue to work cooperatively to survey the Arctic continental shelf; Denmark (Greenland) and Norway have made submissions to the Commission on the Limits of the Continental shelf (CLCS) and Russia is collecting additional data to augment its 2001 CLCS submission; record summer melting of sea ice in the Arctic has renewed interest in maritime shipping lanes and sea floor exploration; Norway and Russia signed a comprehensive maritime boundary agreement in 2010"
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"text": "Canada and the US dispute how to divide the Beaufort Sea and the status of the Northwest Passage but continue to work cooperatively to survey the Arctic continental shelf; Denmark (Greenland) and Norway have made submissions to the Commission on the Limits of the Continental shelf (CLCS) and Russia is collecting additional data to augment its 2001 CLCS submission; record summer melting of sea ice in the Arctic has renewed interest in maritime shipping lanes and sea floor exploration; Norway and Russia signed a comprehensive maritime boundary agreement in 2010"
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}
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}
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}
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}
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},
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"Area - comparative": {
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"text": "slightly less than 6.5 times the size of the US"
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"text": "about 7.5 times the size of the US"
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},
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"Coastline": {
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"text": "111,866 km"
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"Terrain": {
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"text": "surface usually covered with sea ice in Labrador Sea, Denmark Strait, and coastal portions of the Baltic Sea from October to June; clockwise warm-water gyre (broad, circular system of currents) in the northern Atlantic, counterclockwise warm-water gyre in the southern Atlantic; the ocean floor is dominated by the Mid-Atlantic Ridge, a rugged north-south centerline for the entire Atlantic basin"
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},
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"Elevation extremes": {
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"lowest point": {
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"text": "Milwaukee Deep in the Puerto Rico Trench -8,605 m"
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"Elevation": {
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"mean depth": {
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"text": "-3,646 m"
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},
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"highest point": {
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"text": "sea level 0 m"
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"elevation extremes": {
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"text": "lowest point: Milwaukee Deep in the Puerto Rico Trench -8,605 m ++ highest point: sea level 0 m"
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}
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},
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"Natural resources": {
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"text": "major chokepoints include the Dardanelles, Strait of Gibraltar, access to the Panama and Suez Canals; strategic straits include the Strait of Dover, Straits of Florida, Mona Passage, The Sound (Oresund), and Windward Passage; the Equator divides the Atlantic Ocean into the North Atlantic Ocean and South Atlantic Ocean"
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}
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},
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"Government": {
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"Country name": {
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"etymology": {
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"text": "name derives from the Greek description of the waters beyond the Strait of Gibraltar, Atlantis thalassa, meaning \"Sea of Atlas\""
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}
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}
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},
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"Economy": {
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"Economy - overview": {
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"text": "The Atlantic Ocean provides some of the world's most heavily trafficked sea routes, between and within the Eastern and Western Hemispheres. Other economic activity includes the exploitation of natural resources, e.g., fishing, dredging of aragonite sands (The Bahamas), and production of crude oil and natural gas (Caribbean Sea, Gulf of Mexico, and North Sea)."
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"Terrain": {
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"text": "surface currents in the northern Pacific are dominated by a clockwise, warm-water gyre (broad circular system of currents) and in the southern Pacific by a counterclockwise, cool-water gyre; in the northern Pacific, sea ice forms in the Bering Sea and Sea of Okhotsk in winter; in the southern Pacific, sea ice from Antarctica reaches its northernmost extent in October; the ocean floor in the eastern Pacific is dominated by the East Pacific Rise, while the western Pacific is dissected by deep trenches, including the Mariana Trench, which is the world's deepest"
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},
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"Elevation extremes": {
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"lowest point": {
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"text": "Challenger Deep in the Mariana Trench -10,924 m"
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"Elevation": {
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"mean depth": {
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"text": "-3,970 m"
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},
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"highest point": {
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"text": "sea level 0 m"
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"elevation extremes": {
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"text": "lowest point: Challenger Deep in the Mariana Trench -10,924 m ++ highest point: sea level 0 m"
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}
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},
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"Natural resources": {
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"text": "the major chokepoints are the Bering Strait, Panama Canal, Luzon Strait, and the Singapore Strait; the Equator divides the Pacific Ocean into the North Pacific Ocean and the South Pacific Ocean; dotted with low coral islands and rugged volcanic islands in the southwestern Pacific Ocean"
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}
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},
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"Government": {
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"Country name": {
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"etymology": {
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"text": "named by Portuguese explorer Ferdinand MAGELLAN during the Spanish circumnavigation of the world in 1521; encountering favorable winds upon reaching the ocean, he called it \"Mar Pacifico,\" which means \"peaceful sea\" in both Portuguese and Spanish"
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}
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}
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},
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"Economy": {
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"Economy - overview": {
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"text": "The Pacific Ocean is a major contributor to the world economy and particularly to those nations its waters directly touch. It provides low-cost sea transportation between East and West, extensive fishing grounds, offshore oil and gas fields, minerals, and sand and gravel for the construction industry. In 1996, over 60% of the world's fish catch came from the Pacific Ocean. Exploitation of offshore oil and gas reserves is playing an ever-increasing role in the energy supplies of the US, Australia, NZ, China, and Peru. The high cost of recovering offshore oil and gas, combined with the wide swings in world prices for oil since 1985, has led to fluctuations in new drillings."
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