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Valcanoe Definitions

TermDefinition
Element A substance that cannot be broken down into other substances.
Viscosity The property of liquids. It is the resistance of a liquid to flowing.
Silica The viscosity of magma depends on this.
Pahoehoe Fast-moving, hot lava that has a low viscosity.
Aa Lava that is cooler and slower-moving.
Compound A substance made of two or more elements that have been chemically combined.
Lava When magma reaches the surface.
Magma A molten mixture of rock-forming substances, gases, and water from the mantle.
Shield Volcano Gently sloping mountain formed by repeated lava flows.
Cinder Cone Volcano Cone-shaped mountain formed from ash, cinders, and bombs.
Composite Volcano Mountain formed by lava flow alternating with explosive eruptions.
Crater Bowl-shaped area that forms around a volcano's central vent.
Caldera Hole left by the collapse of a volcanic mountain.
Batholith A mass of rock formed when a large body of magma cools inside the crust.
Lava Plateu A high, level area formed by repeated lava flows.
Sill When magma squeezes between horizontal layers of rock.
Dike Magma that forces itself across rock layers hardens.
Vent Where the magma comes out.
Pipe Where magma is,before it erupts.
Hot Spring When groundwater heated by a nearby body of magma rises to the surface and collects in a natural pool.
Ring Of Fire A major belt of volcanoes that rim the Pacific Ocean.
Lava Flow The area covered by lava as it pours out of a volcano's vent.
Magma Chamber Where the magma stays, it is generally located under the volcano.
Geyser A fountain of water and steam that erupts from the ground.
Volcanic Ash Fine rocky particles as small as a speck of dust.
Dormant Is not erupting at the moment.
Active Erupting or showing signs of erupting in the near future.
Extinct Unlikely to erupt again.
Subduction The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary.
Created by: 1962120076
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