CCKH+3.1

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Vocabulary:

 * Volcano:** a weak spot in the crust where molten material or magma comes to the surface.
 * Magma:** a molten mixture of rock-forming substances, gases, and water from the mantle.
 * Lava:** when magma reaches the surface.
 * Ring of Fire:** a major volcanic belt formed by the many volcanoes that rim the Pacific Ocean.
 * Island Arc:** volcanoes creating a string of islands.
 * Hot Spot:** an area where magma from deep within the mantle melts through the crust.

Outline:
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