define crevasse
Crevasse is also a traditional term for a levee breach. Easton Glacier, Mount Baker, in the North Cascades, Washington. A crevasse is a deep crack, or fracture, found in an ice sheet or glacier, as opposed to a crevice that forms in rock. 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.