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randkluft
A randkluft (from the German for ''marginal cleft/crevasse'') is the headwall gap between a glacier or snowfield and the adjacent rock face at the back of the cirque〔Whittow, John (1984). ''Dictionary of Physical Geography''. London: Penguin, 1984, p. 438. ISBN 0-14-051094-X.〕 or, more loosely, between the rock face and the side of the glacier.
== Formation ==
It is formed by the melting of ice against warmer rock and may be very deep. During summer therefore, a randkluft will become wider and thus more difficult for climbers to negotiate. Randklufts are often found in relatively low-lying glaciers such as the Blaueis in the Berchtesgaden Alps or the Höllentalferner in the Wetterstein.
A randkluft is similar to, but not identical with, a bergschrund, which is the place on a high-altitude glacier where the moving ice stream breaks away from the static ice frozen to the rock creating a large crevasse. Unlike a randkluft, a bergschrund has two ice walls.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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