Flash-based demonstrations of geological concepts.
Earth Science sources for K-5 from the American Geological Institute
The Smithsonian's "Earth From Space" explores the beauty and utility of satellite technology. Resources, lesson plans, ties to standards are provided.
VolcanoWorld organizes a great deal of information and web links about volcanos. Some activities are specifically designed for young learners. [geology]
National Park Services - biology, geology, ecology, history.
US Geological Survey Water Science - resources for activities related to water. [biology, geography, ecology]
Explains earth's interior, learn about its tectonic plates and their movements, and discover how mountains, volcanoes, and earthquakes are formed.