earth sci. - earthquakes & plate tectonics

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6 Terms

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convergent boundary

boundary where 2 lithospheric plates collide

can cause tsunamis (ocean-ocean boundary), earthquakes, and subduction & forms mountains, volcanoes, trenches

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subduction

the process where one plate is pushed below another and consumed in the mantle

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trench

long narrow depression of the sea floor that parallels a subduction zone

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divergent boundary

boundary where 2 lithospheric plates are moving apart

causes earthquakes & forms new crust, volcanoes, rifts/ridges

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sea-floor spreading

process where ocean floor is extended when 2 plates move apart

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mid-ocean ridge

underwater mountain range created from a divergent plate boundary