How Does Ice Shape the Land Short Answer
Answer: The huge weight of a moving glacier scoops out the rocks beneath and grinds back the valley-sides as it moves. A deep hollow left at the head of the U-shaped glaciated valley is called a corrie and it may have a lake called a tarn. Aretes are narrow, steep ridges left between two valleys and peaks are worn back to a pyramidal shape. The rocks beneath the glacier are gouged into deep scratches called striations.