Volcanoes

USGS Volcanoes
http://pubs.usgs.gov/gip/volc/

Volcano World
http://volcano.und.nodak.edu/vw.html

How Volcanoes Work
http://www.geology.sdsu.edu/how_volcanoes_work/

Volcanoes Online
http://library.thinkquest.org/17457/english.html

Library Databases

Facts on File

Gale Discovering Collection

World Book Online