What goes on during an earthquake? Who came up with the theory of plate tectonics? What can the fossil record tell us about the evolution of life on Earth? These are all fine questions, and students and educators with a...

This unit provides an introduction for younger students on earthquakes, volcanoes, and how they are related. Topics include evidence of continental drift, types of plate boundaries, types of seismic waves, and how to...

According to theory of plate tectonics, Earth is an active planet -- its surface is composed of many individual plates that move and interact, constantly changing and reshaping Earth's outer layer. Volcanoes and...

This bulletin provides information on the recent eruptive activity of Augustine Volcano in Alaska. Topics include some history of the volcano, its geologic setting as part of the Aleutian island arc, and earthquake...

This report provides an overview of the changes that occurred in lakes in the region around Mount St. Helens following the eruption of May 18, 1980. Topics include water chemistry, sediment supply, and biology. Other...