BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Glacial meltwater outlet cave. View of meltwater flooding out of a cave on the terminal wall of a glacier. Meltwater is produced by the melting of the glacier's own ice. It typically runs down crevasses (fissures) in the glacier's surface, and collects deep in the glacier. Such lakes of water may find their way out of the glacier through networks of tunnels and crevasses, as here. Occasionally, a similar outpouring of water occurs on a much larger scale, and is known as a glacial outburst, or jokulhlaup. This is the Shoup glacier, Alaska, USA.
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