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