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12 Cards in this Set
- Front
- Back
divergent plate boundaries
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plate boundaries where two plates move away from one another; one such example is a mid-ocean ridge (South American and African plates)
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rift valley
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a large, long valley on a continent formed where the continent is pulled apart by the forces of mantle material rising up beneath the continent
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convergent plate boundaries
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plate boundaries where two plates move toward one another (Nazca and South American plates)
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subduction
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the movement of one plate downward into the mantle beneath the edge of the other plate at a convergent plate boundary
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suture zone
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the zone where two continents have met and become welded into a single continent (Indo-Australian plate and Eurasian plate)
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transform plate boundaries
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plate boundaries where two plates slide parallel to (past) one another (North American and Cocos plates)
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transform fault
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a vertical surface between two lithospheric plates moving past each other
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ocean-ocean subduction
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the first type of convergent plate boundary, where one lithospheric plate subducts under the other
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ocean-continent subduction
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the second type of convergent plate boundary, where the oceanic lithosphere subducts under the continental lithosphere (the oceanic lithosphere is denser than the continental lithosphere)
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continent-continent subduction
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the third type of convergent plate boundary, where one continental lithospheric plate (one works its way under the other until friction stops the movement; creates a suture zone)
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volcanic arc
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a chain of volcanic islands formed by rising magma to the ocean floor (built at the edge of the continent in ocean-continent subduction and in the ocean in ocean-ocean subduction)
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San Andreas Fault
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the most famous example of a transform boundary several hundred kilometers long
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