Glacier. View across a glacial valley. The dark stripes on the glacier are well-defined medial (or central) moraines. These are accumulations of rocky debris running along the length of the glacier parallel to the direction of flow. Medial moraine is formed when two glaciers merge, the lateral (side) moraines at the point of merger being carried to the surface of the ice to form a central band of debris. Photographed at the Grosses Aletschgletscher glacier, Switzerland.
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