| LC control no. | sh2005020013 |
|---|---|
| Topical heading | Glacial crevasses |
| Variant(s) | Cracks, Glacial Crevasses, Glacial Fissures, Glacial Glacial cracks Glacial fissures Glacial ice cracks Ice cracks, Glacial |
| See also | Glaciers |
| Found in | Glossary of geology, 1997 (crevasse [glaciol] A deep, nearly vertical fissure, crack, or rift in a glacier or other mass of land ice, or in a snowfield, caused by stresses resulting from differential movement over an uneven surface. Crevasses may be concealed by snowbridges, and some are as much as 100 m in depth. Syn: crevass; fissure [glaciol]; separate entry for: crevasse [geomorph] (a) A wide breach or crack in the bank of a river or canal (b) A wide, deep break or fissure in the Earth after an earthquake (c) A fissure in the surface of a glacier or icefall) McGraw-Hill dict. of sci. and tech., c2003 (crevasse [GEOL] An open, nearly vertical fissure in a glacier or other mass of land ice or the earth, especially after earthquakes) Guyton, B. Glaciers of California, c1998: pp. 10-11 ("Crevasses are open cracks, or fissures, in the ice of a glacier that are several feet wide and hundreds of feet long. Crevasses form because the ice in the upper 100 feet or so of a glacier is brittle and is being carried along, as if on a conveyor belt, by the plastic, flowing ice below. The brittle ice becomes fractured as the flowing ice changes velocity, flows over cliffs, or makes sharp turns in the glacial channel. Ice at the center of a glacier moves faster than ice at the sides, and this difference in speed also creates crevasses.") glossary (Crevasse--An open crack, or fracture, in the ice of a glacier) GeoRef thesaurus, via WebSPIRS, Jan. 4, 2005 (crevasses) Lemke, K.A. Illustrated glossary of alpine glacial landforms, via WWW, Jan. 4, 2005 (Crevasses: cracks in the glacial ice. The upper 30 meters of glacial ice is somewhat brittle, and as the glacier flows, cracks develop. Crevasses rarely extend to depths below approximately 30 meters because the ice below that too plastic and the cracks close) LC database, Jan. 4, 2005 (Glacier travel and crevasse rescue; Crevasse--Glacier Montanvert) Google search, Jan. 4, 2005 (crevasses; fissures; glacial cracks; glacial crevasses; glacial fissures; crevasses--glacial fissures that continually open and close; fissured areas or zones of broken ice in a glacier; crevasses or broken ice zones) |
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