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8.7 NOTES How do glaciers cause erosion? Objective: Explain how a glacier causes erosion. Describe two results of glacial deposition Sometimes gravel and pieces of rock are frozen into the ice at the bottom and along the sides of a glacier. As the glacier moves over bedrock, small pieces of bedrock are scraped and carved away by the rocks set into the glacier. As the valley scrapes away the floor and sides of a valley, it becomes u-shaped. Small side glaciers flow into the main glacier, melt, and leave small glacier valleys, called hanging valleys. Frozen sediments moves with the glacier and is carried to new places. If it moves to warmer places, the ice around the edges begins to melt. Rocks and sediment that were frozen in the glacier are left behind. This loose material is called till. Boulders that have been left behind by a retreating glacier are called erratics. Some have been carried many kilometers away from where they came from. They were frozen into the ice and left behind when the glacier melted.