WILLIAM ERVIN / SCIENCE PHOTO LIBRARY WILLIAM ERVIN / SCIENCE PHOTO LIBRARY
Kahiltna Glacier. Aerial view of the large Kahiltna Glacier amongst mountains. Glaciers are formed by compressed ice and snow which slowly flow down mountains. They typically carve U-shaped valleys during their movement, and may carry vast amounts of debris down the mountain. Photographed in the Denali National Park, Alaska, USA.
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