Glaciers, large masses of ice that act like a plastic and flow downward and outward by the pull of gravity and the weight of the overlying snow, cover about 10% of the earth's land surfaces. In the past, they covered even more of the land. They very dramatically erode the landscape and deposit the resulting eroded debris. Two main types of glaciers are differentiated. Alpine glaciers form on mountains. Continental ice sheet blanket parts of continents. The erosional features differ between the two types, however, depositional features broadly are similar.
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