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g the winter and extends to the encircling land masses; 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 Lomonsov Ridge); maximum depth is 4,665 meters in the Fram Basin Natural resources: sand and gravel aggregates, placer deposits, polymetallic nodules, oil and gas fields, fish, marine mammals (seals and whales) Environment: current issues: endangered marine species include walruses and whales; fragile ecosystem slow to change and slow to recover from disruptions or damage natural hazards: ice islands occasionally break away from northern Ellesmere Island; icebergs calved from glaciers in western Greenland and extreme northeastern Canada; permafrost in islands; virtually icelocked from October to June; ships subject to superstructure icing from October to May international agreements: NA Note: 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 and lasts about 10 months @Arctic Ocean:Government Digraph: XQ @Arctic Ocean:Economy Overview: Economic activity is limited to the exploitation of natural resources, including petroleum, natural gas, fish, and seals. @Arctic Ocean:Transportation Ports: Churchill (Canada), Murmansk (Russia), Prudhoe Bay (US) Note: sparse network of air, ocean, river, and land routes; the Northwest Passage (North America) and Northern Sea Route (Eurasia) are important seasonal waterways @Arctic Ocean:Communications Telephone system: international: no submarine cables ________________________________________________________________________ ARGENTINA @Argentina:Geography Location: Southern South America, bordering the South Atlantic Ocean, between Chile and Uruguay Map references: South America Area: total area: 2,766,890 sq km land area: 2,736,690 sq km comparative area: slightly less than three-tenths the size of the US Land boundaries: total 9,665 km, Bolivia 832 km, Brazil 1,224 km, Chile 5,150 km, Paraguay 1,880 km, Uruguay 579 km Coast
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