AUSTIN S. POST, NSIDC, WDC / SCIENCE PHOTO LIBRARY AUSTIN S. POST, NSIDC, WDC / SCIENCE PHOTO LIBRARY
Glacial retreat. Image 1 of 2. Multiple image panorama of McCall Glacier, Arctic National Wildlife Refuge, Alaska, in 1958. Glaciers are large, slow-moving expanses of ice, formed from compacted layers of snow. They are sensitive to climate change and in recent years most have retreated dramatically. See image E235/399 for a photograph taken from a similar viewpoint in 2004. The National Snow and Ice Data Center (NSIDC) is a US body that supports research into snow, ice, glaciers, frozen ground and climate interactions that make up the Earth's cryosphere. The World Data Center for Glaciology (WDC) in Boulder, USA, is responsible for archiving all available glaciological information.
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