cirque


cirque
/serrk/, n.
1. circle; ring.
2. a bowl-shaped, steep-walled mountain basin carved by glaciation, often containing a small, round lake.
[1595-1605; < F < L circus; see CIRCUS]

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      (French: “circle”), amphitheatre-shaped basin with precipitous walls, at the head of a glacial valley. It generally results from erosion beneath the bergschrund of a glacier. A bergschrund is a large crevasse that lies a short distance from the exposed rock walls and separates the stationary from the moving ice; in early summer it opens, exposing the rock at its base to diurnal changes of temperature. Frost action then causes rapid disintegration of lower rock, which causes the upper rock to avalanche and produce an almost vertical head wall. Resulting rock material is embedded in the glacier and scours a concave floor, which may contain a small lake ( tarn) if the glacier disappears. Expansion of neighbouring cirques produces sharp arêtes, cols, and horns. Because glaciers must originate above the snowline, a survey of the elevations of ancient cirques provides information on climatic change and on the former position of the snow line.

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Universalium. 2010.

Look at other dictionaries:

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  • Cirque — Cirque, n. [F., fr. L. circus.] [1913 Webster] 1. A circle; a circus; a circular erection or arrangement of objects. [1913 Webster] A dismal cirque Of Druid stones upon a forlorn moor. Keats. [1913 Webster] 2. A kind of circular valley in the… …   The Collaborative International Dictionary of English

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  • cirque — (n.) c.1600, circus, from Fr. cirque (14c.), from L. circus (see CIRCUS (Cf. circus)) …   Etymology dictionary

  • cirque — cirque; semi·cirque; …   English syllables

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