Brent Stephenson / Face of a huge glacier with massive crevasses. Neko Harbour, Antarctic Peninsula, Antarctica, January.

Bryan and Cherry Alexander / Tabular iceberg patterned with old crevasses. Snow Hill Island, Antarctica, October 2006.

Bryan and Cherry Alexander / Crevasses in the side of a tabular icebergs, with the annual layers visible. Antarctica, October 2006.

Bryan and Cherry Alexander / Crevasses in the Polar Plateau, covered by snow bridges. Antarctica, January 2006.

Bryan and Cherry Alexander / Crevasses in the Polar Plateau, partly covered in snow. Antarctica, January 2006.

Bryan and Cherry Alexander / Crevasse leading deep into glacier revealing ice bridges and cold blue shadows. Cierva Cove, Antarctica, February 2009.

Colin Monteath / Climbers roped for glacier travel in case of crevasses, Mount Don Roberts, Lemaire Island, Paradise Bay behind, Antarctic Peninsula, Antarctica

Bryan and Cherry Alexander / Crevasses in Greenland Icecap showing movement. Northwest Greenland, 1991.

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

Colin Monteath / Climbers cross open crevasses on Fortuna Glacier retracing Sir Ernest Shackleton's epic crossing of South Georgia in 1916

Konstantin Mikhailov / Glaciers on the "roof" of Mt. Elbrus, Prielbrusie National Park, Central Caucasus, Karacheyevo Cherkessiya, Russia

Christoph Becker / Glacier crevasses, Switzerland Wallis / Rhone