STEVE ALLEN / SCIENCE PHOTO LIBRARY STEVE ALLEN / SCIENCE PHOTO LIBRARY
Crumpled glacier ice. Glaciers are immense rivers of ice, flowing downhill under their own weight. The immense pressures formed by a glacier cause its ice to crumple and buckle, forming the peaks and crevasses seen here. This is the Perito Moreno Glacier in Patagonia, Argentina.
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