Links for more information

NPS Geology - National Park Service Geology page

Geologic Time Scale - chart of epochs, eras, and periods

Volcano Links

NPS Volcano sites – link to list of National Park Service sites with volcanic history or activity
Volcano World – site from the University of North Dakota about volcanoes all over the world
Alaska Volcano Observatory
Cascade Volcano Observatory

Educational materials

• Learner.org
• USGS
• Geological Society of America

Publications

sites for items published by the U.S. Geological Survey about geology and volcanoes

• Earthquakes
• The Severity of An Earthquake
• Eruptions of Hawaiian Volcanoes
• Volcanic and Seismic Hazards on the Island of Hawaii
• Eruptions of Mt. St. Helens
• Geologic time
• Monitoring Active Volcanoes
• Volcanoes by Robert Tilling
• Volcanoes of the United States
  

Video

Video from Nova series on Public Broadcasting Service