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Icefall
An icefall is a portion of a
glacier
that flows over a very steep area in the underlying bedrock much like a waterfall, hence the name "icefall". The relatively fast flowing speed of the glacier in this area causes the upper layers of ice to crack up, producing a very erratic and dangerous surface full of deep wide
crevasses
and
seracs.
Perhaps the most famous of all icefalls is the Khumbu icefall on the western side of
Mount Everest.
