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*Inside Earth - Ch. 3 "Volcanoes" Games

Based on vocabulary from Prentice Hall Science Explorer

volcanoA weak spot in the crust where magma has come to the surface.
magmaThe molten mixture of rock-forming substances, gases, and water from the mantle.
lavaLiquid magma the reaches the surface; also the rock formed when liquid lava hardens.
Ring of FireA major belt of volcanoes that rims the Pacific Ocean.
island arcA string of islands formed by the volcanoes along a deep-ocean trench.
hot spotAn area where magma from deep within the mantle melts through the crust above it.
elementA substance that cannot be broken down into other substances.
compoundA substance in which two or more elements are chemically joined.
viscosityThe resistance of a liquid to flowing.
silicaA material found in magma that is formed from the elements oxygen and silicon.
physical propertyAny characteristic of a substance that can be observed or measured without changing the composition of the substance.
chemical propertiesAny property of a substance that produces a change in the composition of matter.
aaA slow-moving type of lava that hardens to form rough chunks; cooler than pahoehoe.
pahoehoeA hot, fast-moving type of lava that hardens to form smooth, ropelike coils.
magma chamberThe pocket beneath a volcano where magma collects.
pipeA long tube through which magma moves from the magma chamber to Earth's surface.
ventThe opening through which molten rock and gas leave a volcano.
lava flowThe area covered by lava as it pours out of a volcano's vent.
craterA bowl-shaped area that forms around a volcano's central opening.
pyroclastic flowThe expulsion of ash, cinders, bombs, and gases during an explosive volcanic eruption.
dormantDescribes a volcano that is not currently active, but that may become active in the future.
extinctDescribes a volcano that is no longer active and is unlikely to erupt again.
shield volcanoA wide, gently sloping mountain made of layers of lava and formed by quiet eruptions.
cinder coneA steep, cone-shaped hill or small mountain made of volcanic ash, cinders, and bombs piled up around a volcano's opening.
composite volcanoA tall, cone-shaped mountain in which layers of lava alternate with layers of ash and other volcanic materials.
calderaThe large hole at the top of a volcano formed when the roof of a volcano's magma chamber collapses.
volcanic neckA deposit of hardened magma in a volcano's pipe.
dikeA slab of volcanic rock formed when magma forces itself across rock layers.
sillA slab of volcanic rock formed when magma squeezes between layers of rock.
batholithA mass of rock formed when a large body of magma cools inside the crust.
geothermal activityThe heating of underground water by magma.
geyserA fountain of water and steam that builds up pressure underground and erupts at regular intervals.

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