STEVE ALLEN / SCIENCE PHOTO LIBRARY STEVE ALLEN / SCIENCE PHOTO LIBRARY
Glacier in the Juneau Icefield. Aerial view of a glacier in the Juneau Icefield, Alaska, USA. This is one of the largest icefields in North America. The grey streaks in the glacier, which are running parallel to the forward motion of the glacier, are where morraine debris, ground-up rock, is being carried downslope by the glacier. Morrianes mark the sides of glaciers, and also mark where two glaciers converge and meet.
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