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Crevasses are formed due to tensile forces overcoming the cohesive strength of the ice.
They form perpendicular to the principle stress. So depending on what is happening to the Glacier Ice, different types of crevasses can form.
Chevron crevasses form from high friction with the valley sides.
Transverse crevasses form from extending ice flows.
And splaying crevasses form under compressive ice flows.
Hope this helps!
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