Plate tectonics websites

http://www.rocksandminerals4u.com/earths_interior.html

http://scign.jpl.nasa.gov/learn/plate1.htm

http://volcano.oregonstate.edu/vwdocs/vwlessons/lessons/Earths_layers/Earths_layers1.html

http://www.myschoolhouse.com/courses/O/1/69.asp

http://www.pbs.org/wnet/savageearth/animations/hellscrust/main.html

http://pubs.usgs.gov/gip/dynamic/inside.html

http://pubs.usgs.gov/gip/dynamic/hotspots.html