Crevasse
A deep crack, or fracture, in an ice sheet or glacier / From Wikipedia, the free encyclopedia
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Not to be confused with Crevice.
Crevasse is also a traditional term for a levee breach.
A crevasse is a deep crack that forms in a glacier or ice sheet. Crevasses form as a result of the movement and resulting stress associated with the shear stress generated when two semi-rigid pieces above a plastic substrate have different rates of movement. The resulting intensity of the shear stress causes a breakage along the faces.