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crevasse

open fissure in the glacier surface.

Explorers examine a crevasse on Lyman Glacier in 1916. (Photo courtesy of the United States Forest Service. Archived at the World Data Center for Glaciology, Boulder, CO.)
Explorers examine a crevasse on Lyman Glacier in 1916. (Photo courtesy of the United States Forest Service. Archived at the World Data Center for Glaciology, Boulder, CO.)