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Lab_2_Intro_PP FINAL - A Brief Introduction to Plate...

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A Brief Introduction to Plate Tectonics
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Earth’s Plates Lithosphere (= plates): crust and rigid uppermost part of mantle 9 major plates, several smaller ones Plates move over plastically behaving asthenosphere (part of Earth’s mantle)
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Plate Boundaries Divergent: Plates move away from each other New oceanic crust is formed E.g. Mid-Atlantic Ridge Convergent: Plates move towards each other Subduction (crust is destroyed) or collision (mountain building) E.g. Alps Transform: Plates slide past one another No crust forms or gets destroyed e.g. San Andreas Fault, CA
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Transform Faults
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Convergent Margins: India-Asia Collision
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Seafloor Spreading and Plate Boundaries
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Alfred Wegner
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