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Glaciers

All images and text courtesy U.S. Geological Survey and Glacier National Park.

<< 12/12 < How fast a glacier moves is mostly dependent on the thickness of the ice, and on the angle of its surface slope. Glacier speeds vary when changes are made in this geometry. They respond to excessively high seasonal snow accumulations by generating bulges of thicker ice that may move downvalley many times faster than the glacier’s normal velocity.

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