Crevasse
A fissure in a glacier, or snow-field.
The edge is called the lip. It is longitudinal or transverse, according to its direction on glacier. When due to the curve in the glacier, it is marginal. If covered with loose snow, it is concealed. A practicable bridge of ice or snow across a crevasse frequently occurs.
Crest. The highest line of a ridge.
Crête. A ridge.