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Navarin Canyon
The Navarin Canyon is a submarine canyon in the Bering Sea. It is just as wide but less than half as deep as the Zhemchug Canyon, which is the largest canyon in the world. The Navarin Canyon is the third-largest to cut through the Beringian margin. It is the second-largest in area. Though these canyons were not directly formed by rivers, it is postulated that when the sea level was low during the Ice Ages, rivers such as the Yukon and the Kuskokwim The Kuskokwim River or Kusko River (Yup'ik: ''Kusquqvak''; Deg Xinag: ''Digenegh''; Upper Kuskokwim: ''Dichinanek' ''; russian: Кускоквим (''Kuskokvim'')) is a river, long, in Southwest Alaska in the United States. It is the ninth la ... may have shaped in part the heads of these canyons. At the shelf break, it is approximately wide. References Submarine canyons of the Bering Sea {{marine-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Submarine Canyon
A submarine canyon is a steep-sided valley cut into the seabed of the continental slope, sometimes extending well onto the continental shelf, having nearly vertical walls, and occasionally having canyon wall heights of up to 5 km, from canyon floor to canyon rim, as with the Great Bahama Canyon. Just as above-sea-level canyons serve as channels for the flow of water across land, submarine canyons serve as channels for the flow of turbidity currents across the seafloor. Turbidity currents are flows of dense, sediment laden waters that are supplied by rivers, or generated on the seabed by storms, submarine landslides, earthquakes, and other soil disturbances. Turbidity currents travel down slope at great speed (as much as 70 km/h), eroding the continental slope and finally depositing sediment onto the abyssal plain, where the particles settle out.Continental Margin Sedimentation: From Sediment Transport to Sequence Stratigraphy (Special Publication 37 of the IAS) Ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bering Sea
The Bering Sea (, ; rus, Бе́рингово мо́ре, r=Béringovo móre) is a marginal sea of the Northern Pacific Ocean. It forms, along with the Bering Strait, the divide between the two largest landmasses on Earth: Eurasia and The Americas. It comprises a deep water basin, which then rises through a narrow slope into the shallower water above the continental shelf, continental shelves. The Bering Sea is named for Vitus Bering, a Denmark, Danish navigator in Russian service, who, in 1728, was the first European to systematically explore it, sailing from the Pacific Ocean northward to the Arctic Ocean. The Bering Sea is separated from the Gulf of Alaska by the Alaska Peninsula. It covers over and is bordered on the east and northeast by Alaska, on the west by the Russian Far East and the Kamchatka Peninsula, on the south by the Alaska Peninsula and the Aleutian Islands and on the far north by the Bering Strait, which connects the Bering Sea to the Arctic Ocean's Chukchi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zhemchug Canyon
Zhemchug Canyon is an underwater canyon located in the middle of the Bering Sea. It is the deepest submarine canyon in the world, and is also tied for the widest.Normark, W.R. and Carlson, P.R., 2003Giant submarine canyons: Is size any clue to their importance in the rock record? in Chan, M.A., and Archer, A.W., eds., Extreme depositional environments: Mega end members in geologic time: Boulder, Colorado, Geological Society of America Special Paper 370, p. 1–15 Geography It has a vertical relief of dropping from the shallow shelf of the Bering Sea to the depths of the Aleutian Basin. Zhemchug Canyon is deeper than the Grand Canyon which is deep. It has two main branches, each larger than typical continental margin canyons such as the Monterey Canyon. What makes the Zhemchug Canyon the world's largest is not only its great depth, but its immense cross-sectional and drainage area, (11,350 km2) and volume (5800 km3). In 2016, Michelle Ridgeway explored the cany ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ice Age
An ice age is a long period of reduction in the temperature of Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers. Earth's climate alternates between ice ages and greenhouse periods, during which there are no glaciers on the planet. Earth is currently in the Quaternary glaciation. Individual pulses of cold climate within an ice age are termed ''glacial periods'' (or, alternatively, ''glacials, glaciations, glacial stages, stadials, stades'', or colloquially, ''ice ages''), and intermittent warm periods within an ice age are called '' interglacials'' or ''interstadials''. In glaciology, ''ice age'' implies the presence of extensive ice sheets in both northern and southern hemispheres. By this definition, Earth is currently in an interglacial period—the Holocene. The amount of anthropogenic greenhouse gases emitted into Earth's oceans and atmosphere is predicted to prevent the next glacial period for th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yukon River
The Yukon River (Gwichʼin language, Gwich'in: ''Ųųg Han'' or ''Yuk Han'', Central Alaskan Yup'ik language, Yup'ik: ''Kuigpak'', Inupiaq language, Inupiaq: ''Kuukpak'', Deg Xinag language, Deg Xinag: ''Yeqin'', Hän language, Hän: ''Tth'echù'' or ''Chuu k'onn'', Southern Tutchone: Chu Nìikwän, russian: Юкон, Yukon) is a major watercourse of northwestern North America. From its source in British Columbia, Canada, it flows through Canada's territory of Yukon (itself named after the river). The lower half of the river continues westwards through the U.S. state of Alaska. The river is long and empties into the Bering Sea at the Yukon–Kuskokwim Delta. The average flow is . The total drainage area is , of which lies in Canada. The total area is more than 25% larger than Texas or Alberta. The longest river in Alaska and Yukon, it was one of the principal means of transportation during the 1896–1903 Klondike Gold Rush. A portion of the river in Yukon—"The Thirty Mile" se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kuskokwim River
The Kuskokwim River or Kusko River (Yup'ik: ''Kusquqvak''; Deg Xinag: ''Digenegh''; Upper Kuskokwim: ''Dichinanek' ''; russian: Кускоквим (''Kuskokvim'')) is a river, long, in Southwest Alaska in the United States. It is the ninth largest river in the United States by average discharge volume at its mouth and seventeenth largest by basin drainage area. The Kuskokwim River is the longest river system contained entirely within a single U.S. state. The river provides the principal drainage for an area of the remote Alaska Interior on the north and west side of the Alaska Range, flowing southwest into Kuskokwim Bay on the Bering Sea. The highest point in its watershed is Mount Russell. Except for its headwaters in the mountains, the river is broad and flat for its entire course, making it a useful transportation route for many types of watercraft, as well as road vehicles during the winter when it is frozen over. It is the longest free flowing river in the United St ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
