Crevasse
deep crack, or fracture, found in an ice sheet or glacier / From Wikipedia, the free encyclopedia
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.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Glaciereaston.jpg/200px-Glaciereaston.jpg)
Crevasses often have vertical or near-vertical walls, which can then melt and create seracs, arches, and other ice formations.[1]