University of California
University of California: Understanding Earthquakes
This website is a resource for learning about earthquakes. Java animation at this site helps you visually understand the causes of earthquakes.
Exploratorium
Exploratorium: Earthquake Faultline Earthquake Activities
This outstanding website provides an excellent variety of hands-on earthquake activities to help you understand what causes earthquakes.
Curated OER
National Park Service: Explore Nature: Views: Volcanism: Embark on a Journey
A journey into the depths of a volcano teaches students about volcanic rocks, eruptions, features, and locations. Also find out how volcanologists monitor activity and conduct scientific research on eruptions.