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Support provided by: NOVA MENU Watch TV Schedule Education Shop NOVA Watch TV Schedule Education Shop NOVA Search... share Anatomy of a Volcano By Lexi Krock Posted 11.12.02 NOVA Whats the difference between lava and magma? What are volcanic vents, dikes, and fissures? In this anatomy of a volcano, explore the basic g

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A volcano is a rupture in the crust of a planetary-mass object , such as Earth , that allows hot lava , volcanic ash , and gases to escape from a magma chamber below the surface. Earths volcanoes occur because its crust is broken into major, rigid tectonic plates that float on a hotter, softer layer in its mantle. Ther

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