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USGS Geology in the Parks
This "non-technical approach to geology" explains geologic maps, plate tectonics, rocks and minerals, geologic time, geomorphic provinces, sand dunes, caves, and coasts. Includes profiles of the geology of several national parks, a glossary, maps, animations, and other images. A collaboration between the U.S. Geological Survey (USGS) and the National Park Service.
http://www.nature.nps.gov/geology/usgsnps/project/home.html
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