jcjc3.1

__**Notes 3.1 Volanoes and plate tectonics**__
__**Vocabulary**__
 * Volcano:** A weak spot in the crust where molten magma comes up to the surface
 * Magma:** A molten mixture of rock forming substances,gases,and water from the mantle.
 * Lava:** When magma reaches the surface.
 * Island arc:** When the resulting of volcanoes form a string of islands.
 * hot spot:** An area where magma from deep in the mantle melts through the crust.