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Transverse crevasses, Chugach State Park, Alaska. A crevasse is a deep crack that forms in a glacier or ice sheet. Crevasses form as a result of the movement and resulting stress associated with the shear stress generated when two semi-rigid pieces above a plastic substrate have different rates of movement. The resulting intensity of the shear ...
A crevasse that forms on the upper portion of a glacier where the moving section pulls away from the headwall. beta Information on how to complete (or protect) a particular climbing route. See on-sight and flash. [1] [2] [3] beta break In sport climbing, a move on a climbing route other than the move originally intended by the route setter. In ...
A crevasse may be as deep as 45 m (148 ft) and as wide as 20 m (66 ft). [11] A crevasse may be covered, but not necessarily filled, by a snow bridge made of the previous years' accumulation and snow drifts. The result is that crevasses are rendered invisible, and extremely dangerous to anyone attempting to traverse a glacier. [12]
The first order cause of calving is longitudinal stretching, which controls the formation of crevasses. When crevasses penetrate the full thickness of the ice, calving will occur. [ 12 ] Longitudinal stretching is controlled by friction at the base and edges of the glacier, glacier geometry and water pressure at the bed.
Marginal crevasses form near the edge of the glacier, caused by the reduction in speed caused by friction of the valley walls. Marginal crevasses are largely transverse to flow. Moving glacier ice can sometimes separate from the stagnant ice above, forming a bergschrund. Bergschrunds resemble crevasses but are singular features at a glacier's ...
A bergschrund (from the German for mountain cleft; sometimes abbreviated in English to "schrund") is a crevasse that forms where moving glacier ice separates from the stagnant ice or firn above. [1] It is often a serious obstacle for mountaineers. Bergschrunds extend to the bedrock, and can have a depth of well over 100 metres (330 ft).
President-elect Donald Trump is poised to seize greater control of the federal government than any modern president before him when he takes office on Monday, charging ahead with plans to ...
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