Under what conditions do large crevasses develop in glaciers? What forces act to produce them, and
where in the glacier are they found? What happens if a glacier descends over a steep precipice? What will be an ideal response?
Crevasses develop where glaciers flow over an increase in the slope of the underlying surface or where
they flow around a corner. The ice is stretched due to tensional forces. The crevasses open and extend
down to the zone of plastic flow. If a glacier descends over a steep precipice, the crevasses break up
the ice into a jumble of blocks and spires, and an icefall develops
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