marginal crevasse
geology
Quick Summary
A marginal crevasse is a fissure that forms on the sides of valley glaciers. These crevasses point obliquely up the valley. They develop when the central part of a glacier moves significantly faster than its outer edges. Crevasses, in general, are cracks in a glacier caused by stress from movement. They can be up to 20 meters wide, 45 meters deep, and several hundred meters long.12
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