Unit 4 Plate Tectonics
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Tectonic/Crustal plates | Large, moving pieces of Earth’s lithosphere that rest on the asthenosphere
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| Tectonic/Crustal plates | Commonly carries both oceanic and continental crust
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| Continental Drift | A hypothesis made by Alfred Wegener in 1912
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| Continental Drift | Continents were once joined together but moved apart over time
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| Pangaea | Supercontinent that included all of the landmasses on Earth; began breaking apart about 200 million years ago
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| Plate Tectonics | Theory that pieces of Earth’s lithosphere are in constant motion, driven by convection currents in the mantle
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| Divergent Boundary | Boundary along which two tectonic plates move away from each other
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| Divergent Boundary | The sea floor spreads apart and new crust is formed
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| Convergent Boundary | Boundary along which two tectonic plates move toward each other
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| Convergent Boundary | Characterized by subduction or continental collision
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| Convergent Boundary | Crust is usually destroyed
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| Transform Boundary | Boundary along which two tectonic plates scrape past each other
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| Transform Boundary | Characterized by earthquakes; crust isn’t created or destroyed
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| Hot spot | An area where a column of hot material rises from deep within the mantle. -Lithosphere above is heated, causing volcanic activity at the surface
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| Subduction | The process by which denser crust sinks beneath less dense crust
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| Rift valley | A deep valley formed as tectonic plates move away from each other at a divergent boundary
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| Mid-ocean ridge | An underwater mountain range where new ocean crust is formed by volcanic activity along a divergent boundary
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| Ocean basin | A great depression occupied by the ocean on the surface of the lithosphere
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