BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Glacier. View of a glacier advancing into a green valley. The top of this glacier is cracked into towering spires of ice by countless deep crevasses. Crevasses are formed by parts of the ice of the glacier moving at different rates, cracking the surface. This typically happens as the ice on the sides of a glacier moves more slowly than the ice at the centre. When the glacier moves into a wider area, the sides flow outwards, which also causes crevasses to form. This is the Hole in the Wall glacier, Alaska, USA.
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