Cirque

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If the cirque is subject to seasonal melting, the floor of the cirque most often forms a tarn (small '''[[lake]]''') behind the Moraine and glacial till damming the outlet. If the cirque is subject to seasonal melting, the floor of the cirque most often forms a tarn (small '''[[lake]]''') behind the Moraine and glacial till damming the outlet.
 +[[Image:Cirqueglacier.jpg|thumb]]
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Revision as of 21:33, 14 July 2010

A steep-walled mountain basin which usually forms the blunt end of a valley. (French for "circus.")
A steep-walled mountain basin which usually forms the blunt end of a valley. (French for "circus.")

A steep-walled mountain basin which usually forms the blunt end of a valley. (French for "circus.")

The concave amphitheatre shape is open on the downhill side corresponding to the flatter area of the stage, while the cupped seating section is generally steep cliff-like slopes down which ice and glaciated debris combine and converge from the three or more higher sides.

The floor of the cirque ends up bowl shaped as it is the complex convergence zone of combining ice flows from multiple directions and their accompanying rock burdens, hence experiences somewhat greater erosion forces, and is most often scooped out somewhat below the level of cirque's low-side outlet (stage) and its down slope (backstage) valley.

If the cirque is subject to seasonal melting, the floor of the cirque most often forms a tarn (small lake) behind the Moraine and glacial till damming the outlet.


Reference

  • Wikipedia Cirque [1]

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