BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Glacier. Aerial view of the Hubbard Glacier, Alaska, USA. The glacier is seen here with a cruise ship (upper left). The Hubbard Glacier is a vast expanse of ice, 120 kilometres long, covering an area of around 3500 square kilometres. The deep crevasses seen on its surface are created when planes of ice within the glacier move past each other, causing shear forces that force trenches to develop.
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