A very irregular ice surface on a glacier.
It may include an impenetrable system of pillars and pinnacles several meters
tall. A seracs usually forms at the foot of an icefall, caused by compression
of a crevassed section of the glacier. This, in turn, results from an increase
in the gradient of the moving ice or because its speed is somewhat reduced.
|Crevasses and seracs of the Franz Josef Glacier,
AND PLANETARY SCIENCE