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Chapter 3 Vocab

science Vocab

volcanoA weak spot in the crust where
volcano A weak spot in the crust where magma has come to the surface.
Lava Liquid magma that reacher the surface; also the rock formed when liquid lava hardens.
magma The molten mixture of rock-forming substances, gases, and water from the mantle.
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.
magma chamber The pocket beneath a volcano where magma collects.
pipe A long tube through which magma moves from the magma chamber to earths surface.
vent The opening through which molten rock and gas leave a volcano.
lava flow The area covered by lava as it pours out of a volcano's vent.
crater a bowl - shaped area that forms around a volcanos central opening
silica A material that is formed from the elements oxygen and silicon; silica is found in magma.
pahoehoe A hot, fast-moving type of lava that hardens to form smooth, rope like coils.
aa A slow-moving type of lava that hardens to form rough chunks; cooler than pahoehoe.
pyroclastic flow The espulsion of ash, cinders, bombs, and gases during and explosive volcanic eruption.
Active Avolvano that is erupting or has shown signs of erupting in the near future.
Dormant A slow-moving type of lava that hardens to form rough chunks; cooler than pahoehoe.
extinct A volcano that will not erupt again.
hot spring A pool formed by groundwater that has risen to the surface after being heated by a nearby body of magma
Geyser A fountain of water and steam that builds up pressure underground and erupts at regular intervals.
Geothermal energy Energy from water or steam that Haas been heated by magma .
Created by: lafaveain
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