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| When glaciers pass down a mountain it usually follows an old river bed. The river leaves a v-shape in the bottom of the valley and has smaller stream beds where streams used to bring water into the larger river. So, when the glacier begins to form it moves down the river bed and carves the bottom of the valley and the sides of the mountains. As the glacier scrapes and picks up different materials from the floor of the valley it also changes the way the mountain and valley look. | ||||||||