Earth's rocky outer layer
one of the large pieces that Earth's crust is broken into
the line along which something ends
a mountain that forms in Earth's crust when magma reaches the surface
a molten mixture of rock-forming substances, gases, and water from the mantle
the term used for magma when it reaches Earth's surface
Ring of Fire
a major belt of volcanoes that rims the Pacific Ocean
a string of volcanic islands created along a converging boundary
a concentration of heat in the mantle capable of producing magma, which rises to Earth's surface
the area beneath a volcano where magma accumulates
a long tube that extends from Earth's crust us through the top of the volcano, connecting the magma chamber to Earth's surface
any place where molten rock and gas leave a volcano
the spread of lava as it pours out of a vent
a bowl-shaped area that may form at the top of a volcano around the central vent
a material found in magma that forms from oxygen and silicon
the mixture of hot gases, ash, cinders, and bombs that flow down the sides of a volcano when it erupts explosively
sleeping; expected to awaken in the future and become active
dead; unlikely to ever erupt again
the hole left when a volcano collapses
volcanic material that has built up around a vent into a steep, cone-shaped hill or small mountain
tall, cone-shaped mountains in which layers of lava alternate with layers of ash
thin layers of lava pour out of a vent and harden on top of previous layers slowly building a wide, gently sloping mountain
formed when magma hardens in a volcano's pipe and the surrounding rock later wears away
magma that forces itself across rock layers and then hardens
magma that squeezes between horizontal rock layers and then hardens
a mass of rock formed when a large body of magma cools inside the crust
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