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Two adjacent cracks exist on a mountain side. The two cracks or hollows are filled with ice. The ice erodes the sides through plucking and deepens the hollow through abrasion. Through erosion, the back walls of the hollows slowly recede and eventually the hollows or cirques are separated by a knife-edged ridge.The ridge is called an arete.
maurice.mutuku answered the question on June 8, 2017 at 11:29
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