Plate Tectonics (7.15) USGS Dynamic Earth  Lots of information about plate tectonics including the history of the development of the theory. USGS Earthquakes and Plate Techtonics More information from USGS about earthquakes; informative maps. Earth Floor An interesting MIddle School site with lots of information. Enchanted Learning Good graphics and easy to read information. Discover Our Earth Lots of information about earth quakes and volcanoes plus some interactive activities.    USGS Volcanoes of the US  Last updated July 6 2006