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| Density: | The quality or condition of being dense.
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| Crust: | The outer shell of earth including the continents of the ocean floor.This is the lithosphere, formed of sial and sima.
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| Continental Crust: | The basement complex of rock, that is, meamorphosed sedimentary and volcsnic rock with associated igneous rocks mainly granitic, that underlies the continents and the continent and the continental shelves.
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| Convection Current: | Mass movement of subcrustal or matle materisl sd the result of temperture variations.
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| Convection Current: | Mass movement of subcrustal or matle material as the result of temperture variations.
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| Oceanic Crust: | A thick mass of igneous rock which lies under the ocean floor.
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| Convection: | The act or process of conveying; transmission.
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| Outer Core: | The outer or upper zone of the warth's core, extending to a depth of 3160 miles,and including the transition zone.
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| Asthnophere : | A zone of the earth's matle that lies beneath the lithosphere and consists of severl hundred kilometers of deformable rock.
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| Tectonic Plates: | Anyone of the internally rigid crustal blocks of the lithosphere which move horzontally across the earth's surface relative to one another.Also known as crustal plate.
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| Seismic Waves: | Vibration genated by a earthquake,explosion,or similar phenomnon and propagated within the earth or along it's surface.
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| Seafloor-spreading: | Theory that oceanic crust forms along sumarine mountain zones, known collectively as the ocean ridge system, and spreads out laterally away from them.
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| Mid-ocean Ridge: | A series of mountain ranges on the ocean floor,more than 84,000 kilometers in length.
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| Rift Valley: | A vally that has developed along a rift.
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| Convergent Boundary: | In plate tectonics, a convergent boundary, also known as a destructive plate boundary.
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| Divergent Boundary: | The two tectonic plates move away from each other
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| Tranform Boundary: | A strike-slip fault,common in mid-ocean ridge regions.
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| Stress: | force against earth's surface.
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| Folding: | The bending of rock layer due to stress.
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| Seismograph: | A inturmet that records vibration in the ground and determines the location and strength of s earthquake.
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| Lava: | The stuff from earth's core.
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| Deformation: | The bending,tilg,and breaking of earth's crust.
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| Fault: | A break in the body ro.ck a long which one block slides relative to another
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| Epiccenter: | The point on earth's surface surface directly aove an earthquake's starting point.
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| volcano: | A vent or a fissure in earth surface.
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| compression: | Stress that occures when forces act to squeeze a object.
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| Rift zone: | A area of deep cracks that form bettween two tectonic plates.
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| Focus: | The point along a fault of which the frist motion of a earthquake.
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| Vent: | A opening at the surface of earth.
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| Tension: | Stress that occurs when forces act to stretch a object.
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| Earthquake: | Cause by a fault.
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| Magnitude: | How big the earthquake is.
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| Ring of fire: | ring of volcanos in a ocean.
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| Shearing: | Plates moving away from each other.
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| Seimic wave: | A wave of enegry that travels away from the earthquake.
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| Magma: | Lava that comes out a volcano.
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| Hot Spot Volcano: | A active volcano.
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