American Geophysical Union
Geological Society of America
Mineralogy Database
Volcano Eruption News
USGS Cascades Volcano Observatory
USGS Hawaiian Volcano Observatory
USGS Alaska Volcano Observatory
USGS Long Valley Volcano Observatory
USGS Yellowstone Volcano Observatory
USGS Volcano Hazards Program
USGS Volcano Disaster Assistance Program
Mount St. Helens Institute
USGS Earthquake Homepage
Ol Doinyo Lengai Volcano, Tanzania (Prof. F. Belton, MTSU)
Mars Global Surveyor (NASA)
Center for Earthquake Research and Information (University of Memphis)
How Volcanoes Work
Mineral Information Institute
Tennessee Division of Geology
USGS Mineral Resource Program
Smithsonian Institute - National Museum of Natural History
The Volcano Information Center
Volcano World
List of Earth Science/Geology Professional Societies