Volcanos
http://volcano.und.nodak.edu
http://science.nhmccd.edu/biol/animatio.htm

Earthquakes
http://earthquake.usgs.gov/4kids

Sea floor spreading
http://www.uwsp.edu/geo/faculty/ritter/glossary/s_u/sea_flr_spread.html

Plate techtonics
http://www.pbs.org/wgbh/aso/tryit/tectonics
http://www.scotese.com/sfsanim.htm

Geology Lab
http://vcourseware4.calstatela.edu