www.geology.sdsu.edu/how_volcanoes_work  How Volcanoes Work. (6-12) This website is an educational resource that describes the science behind volcanoes and volcanic processes. The site is sponsored by NASA under the auspices of Project ALERT (Augmented Learning Environment and Renewable Teaching). It is intended for the education of pre-service teachers, in-service teachers, and university students of geology and volcanology.

http://pubs.usgs.gov/gip/volcus Volcanoes of the US  (6-12) This site is from the USGS

http://volcano.oregonstate.edu  Volcano World (6-12) This site is from UND and Oregon Space Grant Consortia 

http://www.volcanoes.com Volcanoes (4-12) This is a site on volcanoes around the world.

http://www.learner.org/exhibits/volcanoes  Volcanoes - Can We Predict Volcanic Eruptions? (6-12) This site is from Learner.org