JEFF GREENBERG / SCIENCE PHOTO LIBRARY JEFF GREENBERG / SCIENCE PHOTO LIBRARY
Taku Glacier. Aerial view of the Taku Glacier taken from a flightseeing helicopter. A glacier occurs when more snow falls than melts. Over time, layers of fallen snow become compacted, forming ice. The mass of the ice in a glacier flows under the pull of gravity. As a glacier moves, it removes material from one location (erosion) and carries it to another (deposition). Photographed in Juneau, Alaska, USA.
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