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