crevasse
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Glacier in Patagonia, Argentina. Deep cracks known as crevasses can be seen in the ice. These are formed when a glacier moves over an uneven surface. When the glacier reaches the sea, or as in this picture, a lake, the crevasses will fracture the ice to form icebergs.
Deep crack in the surface of a glacier; it can reach several metres in depth. Crevasses often occur where a glacier flows over the break of a slope, because the upper layers of ice are unable to stretch and cracks result. Crevasses may also form at the edges of glaciers owing to friction with the bedrock.
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