Christoph Becker / Glacier crevasses, Switzerland Wallis / Rhone

Doug Allan / Heavily crevassed glacier (right) meets frozen sea ice (left) Svalbard, Norway

Doug Allan / Heavily crevassed glacier (right) meets frozen sea ice (left) Svalbard, Norway

Onne van der Wal / Person peering into the depths of a narrow crevasse on glacier, Spitsbergen, Svalbard, Norway, 1998.

Onne van der Wal / Looking into a narrow crevasse on a glacier, Spitsbergen, Svalbard, Norway.

Roberto Rinaldi / Climbers on top of the Perito Moreno glacier surface where very deep crevasses open up, Los Glaciares National Park, Patagonia, Argentina

Jan Vermeer / Crevasses created by the melting of the ice, Antarctica