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Download Theory of Plate Tectonics
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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? Plate Tectonics Plate Tectonics Theory that the Earth’s lithosphere is divided into tectonic plates that move on top of the asthenosphere Plate movement 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 Tectonic Plate Boundaries Convergent Divergent Transform Convergent Plate Boundaries When two plates push into each other Classification based on crust: Continental/Continental Continental/Oceanic Oceanic/Oceanic 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 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 Transform Plate Boundary Two plates slide past each other horizontally San Andreas Fault is example
