BRUCE F. MOLNIA, NSIDC, WDC / SCIENCE PHOTO LIBRARY BRUCE F. MOLNIA, NSIDC, WDC / SCIENCE PHOTO LIBRARY
Glacial retreat. Image 2 of 2. Carroll Glacier, Glacier Bay National Park, Alaska, in 2004. The terminus of the glacier is just visible at centre middle. Most of the foreground is dry terrain. In recent years, the glacier has retreated dramatically, see image E235/384 for a photo of Carroll Glacier taken from the same viewpoint in 1906. 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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