a weak spot in the crust where magma has come to the surface.

the molten mixture of rock-forming substances, gases, and water from the mantle.

liquid magma that reaches the surface; also the rock formed when liquid lava hardens

a major belt of volcanoes that rims the Pacific Ocean.

a string of islands formed by the volcanoes along a deep ocean trench.

an area where magma from deep within the mantle melts through the crust above it.

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Volcanoes

Inside Earth: Chapter Three, Section One

Term	Definition
volcano	a weak spot in the crust where magma has come to the surface.
magma	the molten mixture of rock-forming substances, gases, and water from the mantle.
lava	liquid magma that reaches the surface; also the rock formed when liquid lava hardens
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	an area where magma from deep within the mantle melts through the crust above it.