Common Questions and Myths About Glaciers. Why are there glaciers? Glaciers form where more snow falls than melts over a period of years, compacts into ice, and becomes thick enough to begin to move. That is, a snow patch becomes a glacier when the deepest layers begin to deform due to the weight of the overlying snow and ice. Common Questions and Myths About Glaciers - Glacier Bay National Park & Preserve (U.S. National Park Service)
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