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Theory of Plate Tectonics

Theory of Plate Tectonics. Power of Plate Motion. Chilean Earthquake Chile Quake Poses Possible Hawaii Tsunami Threat Major Earthquake in Haiti 2010. A New Theory. Sea-floor spreading supported Wegener’s Continental Drift How do we explain Sea-floor spreading and Continental Drift?

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Theory of Plate Tectonics

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  1. Theory of Plate Tectonics

  2. Power of Plate Motion • Chilean Earthquake • Chile Quake Poses Possible Hawaii Tsunami Threat • Major Earthquake in Haiti 2010

  3. A New Theory • Sea-floor spreading supported Wegener’s Continental Drift • How do we explain Sea-floor spreading and Continental Drift? • Plate Tectonics

  4. Plate Tectonics • Theory that the Earth’s lithosphere is divided into tectonic plates that move on top of the asthenosphere • Plate movement

  5. Convection • Hot material rises while cool material sinks • Cool material is dense • The motion of sinking and rising material drags the tectonic plate away from mid-ocean ridge • Flash Presentation

  6. Tectonic Plate Boundaries • Convergent • Divergent • Transform

  7. Convergent Plate Boundaries • When two plates push into each other • Classification based on crust: • Continental/Continental • Continental/Oceanic • Oceanic/Oceanic

  8. Subduction Zones • Region where the oceanic plate sinks into the asthenosphere • Volcanic formations frequently occur • Formed at Convergent Boundary • Continental/oceanic • Oceanic/oceanic • Ocean Trenches = feature of boundary

  9. Divergent Plate Boundary • Two plate move away from each other • Where new oceanic lithosphere forms • Can form on land as well: rift valley • Example is mid-ocean ridge

  10. Transform Plate Boundary • Two plates slide past each other horizontally • San Andreas Fault is example

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