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| Earth Materials-Geology |  |
The Image - Minerals http://www.theimage.com/mineral/minerals1.html U. S. Geological Survey http://www.usgs.gov Savage Earth http://www.pbs.org/wnet/savageearth/ Plate Tectonics http://pubs.usgs.gov/publications/text/dynamic.html Earthquakes for Kids http://earthquake.usgs.gov/4kids/ |
