BRUCE F. MOLNIA, NSIDC, WDC / SCIENCE PHOTO LIBRARY BRUCE F. MOLNIA, NSIDC, WDC / SCIENCE PHOTO LIBRARY
Glacial retreat. Image 2 of 2. Muir Glacier, Glacier Bay National Park, Alaska, photographed in 2005. Compared to a photograph taken from the same point in 1902 (E235/396), the glacier and ice have completely disappeared from view by 2005. 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. 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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