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Volcanoes

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volcano
a weak spot in the crust where magma has come to the surface
magma
a molten mixture of rock-forming substances, gases, and water from the mantle
lava
magma that reaches Earth's surface
Ring of Fire
a major belt of volcanoes that rims the Pacific Ocean
island arc
A string of islands formed by the volcanoes along a deep ocean trench
hot spot
unusually hot region of the mantle which causes rock to melt, rise, and form a volcano