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Volcanoes—Sources and Types of Lava

Run Time: 00:07:00

Volcanologist Dave Sherrod of the Hawaii Volcano Observatory, USGS, and Michael Manga, Associate Professor of Hydrogeology at the University of California, Berkeley, describe how mantle rock melts into magma and how the more buoyant, liquid magma floats toward the Earth's surface. They also compare the amount of dissolved gases in Hawaiian volcanoes versus Mount St. Helens. Different compositions of magma create shield volcanoes and stratovolcanoes. Gas-enriched, higher-silica eruptions create classic stratovolcanoes, while the less-gaseous, low-silica magma in the Hawaiian volcanoes erupts to create shield volcanoes. Featured Scientists: Chuck Blay, Ph.D., Keith Klepeis, Ph.D., Andy Kurtz, Ph.D., Michael Manga, Ph.D., and David Sherrod, Ph.D.


NSES Standard

Grades 5-8 Standard D. Some changes in the solid earth can be described as the "rock cycle".

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