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A mass of ice which may be moving, or has moved, overland: when enough ice has accumulated, a glacier will start to move forwards. A glacier may be seen to be the result of a balance between accumulation and ablation. Glaciers are classified by their location (cirque glacier, expanded-foot glacier, valley glacier, niche glacier, piedmont glacier), by their function (diffluent glacier, outlet glacier), or by their basal temperature (cold glacier, warm glacier).

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