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14 Cards in this Set
- Front
- Back
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Ocean Crust
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Material on the ocean floor.
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Cont'l Crust
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Make s up the continental land masses.
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Plate Tectonics
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Hypothesis of sea floor spreading and cont'l drift led to the formulation of a theory.
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Lithosphere
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The oceanic crust and the cont'l crust. It forms the outer shell of the earth.
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Asthenosphere
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Beaneath the lithosphere, a layer of plastic rack, that is, solid rock able to flow. PLASTICITY
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Diveregent boundary
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Two plates moving away from eachother.
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Rift Valley
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Center of a mid-ocean rnage is a narrow valley formed as the plates seperate.
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Converegent Boundary
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The direct collision of one plate with another.
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Subduction Zone
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This where one plate moves or slides underneath another plate.
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Ocean Trench
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generally forms along a subductin Zone, as the oceanic plates move down into the zone, it melts and becomes part of the mantle material.
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Island Arc
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Part of the subducted plate melts, and the resulting molten rock rises to the surface along a trenc to form a chain of volcanic islands.
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Transform Fault Boundary
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Where two plates are grinding past eachother, the plate edges usually do not slide along smoothly and scratch and grind agains tht eother plate.
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Convection Current
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As the water at the bottom of the pot heats up, it expands and becomes less dense than cool water above it. The cool water, Which is now denser than the heated water sinks and forces the warm water to the surface.
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Theory of suspect Terranes
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New discoveries are providing some possible explanations of how continents formed. Suggests that the contintents are actually a patchwork of terrranes.
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