How Volcanoes Work was constructed and is maintained by Dr. Vic Camp from San Diego State University's Department of Geological Sciences. The site takes a comprehensive look into every aspect of volcanic formations and eruptions, including historical eruptions (Mt. St. Helens) and volcanism on other planets. Well written and designed, this site offers excellent illustrations, photographs, and several multimedia files such as a cross-sectional view of an eruption taking place. Anyone from geology students to lifelong learners will find this site interesting and informative.