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Section 3-1 Volcanoes and Plate Tectonics (back to homepage)

 * Vocabulary**


 * volcano**- a weak spot in the crust where molten material, or magma comes to the surface
 * magma**- a molten material of rock-forming substances,water from the mantle, and gases
 * lava**- magma that has reached Earth's surface
 * Ring of Fire**- a major volcano belt formed by many volcanoes at the Pacific Rim
 * island arc**- a string of islands formed by the volcanoes along the deep ocean trench
 * hot spot** - an area where magma from deep within the mantle melts through the trench like a blow torch