Geology
Complete guide to earth science from About.com
Geology.com
Portal for geology and earth science with links to sites on plate tectonics, minerals and rocks, astronomy, and more
GeologyLink
Student resource center from Houghton Mifflin
Landslide Hazards
Information on the landslide problem and the landslide hazards program at the USGS (U.S. Geological Survey)
USGS
Online edition of the book, "Volcanoes", by Robert I. Tilling
World-Wide Earthquake Locator
Quake report, mapping, and predictions from the Edinburgh Earth Observatory
Aquatic Network
Information about living resources relating to marine and freshwater environments
National Oceanographic Data Center
Beach temperatures, ocean data, ocean atlas, and photos (
Ocean Explorer
Library, photo and video gallery, explorations, and more from the National Oceanic and Atmospheric Administration
Oceanography
Office of Naval Research site with ocean facts, information, and naval discoveries