Crevasse

A crevasse is a deep crack, or fracture, found in an ice sheet or glacier. It is like a crevice that forms in rock. Crevasses form as a result of the movement caused by the shear stress between two semi-rigid pieces of ice.

Crevasse in Easton Glacier, Mount Baker, in the North Cascades, Washington

Crevasses often have vertical or near-vertical walls, which can then melt and create seracs, arches, and other ice formations.[1]

References
  1. van der Veen, C (1990). "Crevasses on Glaciers". Polar Geography. 23 (3): 213–245. doi:10.1080/10889379909377677.
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