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17 Cards in this Set
- Front
- Back
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Factors controlling density of earths materials |
Composition, temperature, pressure |
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P waves |
Attempt to change the volume of material Particle motion is parallel to the wave propagation direction |
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S waves |
Attempt to change the shape of material Particle motion is perpendicular to wave propagation direction |
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Surface waves |
Most damage to structures |
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Core |
Must be high density and magnetic Solid- inner Liquid- outer |
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Convection |
Within earth’s outer core generates the magnetic field Result of Earth’s rotation and compositional variation |
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Mantle |
Most is solid but asthenosphere exhibits plastic behavior Composed of silicate minerals of ultramafic |
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Upper mantle |
Lithosphere |
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Oceanic crust |
Composed of mafic rock |
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Continental crust |
Composed Felsic rock |
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Buoyancy/ isostacy |
Continental lithosphere is thicker and less dense than oceanic crust |
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Mid ocean ridge |
Mirror image if magnetic signature Where Heat flow is greatest Sea floor spreading, volcanic activity, mafic, igneous rock |
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Hydrothermal vents |
Ocean water circulated through the crust, dissolving metals which comes out at vents on ocean floor |
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Why is there a change in continental slope?? |
Change in continental and oceanic crust |
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Carbon in the ocean |
Deep ocean stores carbon, transferred downward and into lithosphere through work of microorganism |
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Thermohaline circulation |
Driven by temp and density diff caused by sinking of cold, dense water in North Atlantic |
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Upwelling |
Replacement of warm nutrient poor surface water with cool nutrient rich deep water |
