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View Resource Tectonic Plates, Earthquakes, and Volcanoes

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 earthquakes both result from the movement of tectonic plates. This interactive feature shows the relationship between earthquakes and volcanoes and the boundaries of tectonic plates. By...

View Resource Mount Pinatubo: Predicting a Volcanic Eruption

In spite of the unpredictability of volcanoes, scientists have learned to read the many signs they display prior to an eruption, in the hope of minimizing damage to lives and personal property. This video segment describes efforts of scientists at the Pinatubo Volcanic Observatory to read the signs presented by Mount Pinatubo, just before it unleashed one of the most powerful eruptions of the...

View Resource Mount St. Helens: Before and After

When Mount St. Helens erupted on May 18, 1980, the top 400 meters (1,300 feet) of the volcano disappeared in a blast that covered more than 390 square kilometers (150 square miles) and sent thousands of tons of ash into the upper atmosphere. This collection of still images and video depict before-and-after scenes of Mount St. Helens and its surroundings, allowing viewers to witness the results of...

View Resource EarthScope: Activity at Augustine Volcano

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 locations as indicators of magma movement. The bulletin is also accompanied by a 360-degree rotation around the volcano and background information on the EarthScope Project.

View Resource Anatomy of a Volcano

This interactive lesson from NOVA Online provides a detailed look at the inner workings of one of the world's most dangerous volcanoes, Nyiragongo in the Democratic Republic of Congo. Users can click on highlighted points on a crossection of the volcano to see photos and read about its features and eruptive products.

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