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12 Cards in this Set

  • Front
  • Back
divergent plate boundaries
plate boundaries where two plates move away from one another; one such example is a mid-ocean ridge (South American and African plates)
rift valley
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
convergent plate boundaries
plate boundaries where two plates move toward one another (Nazca and South American plates)
the movement of one plate downward into the mantle beneath the edge of the other plate at a convergent plate boundary
suture zone
the zone where two continents have met and become welded into a single continent (Indo-Australian plate and Eurasian plate)
transform plate boundaries
plate boundaries where two plates slide parallel to (past) one another (North American and Cocos plates)
transform fault
a vertical surface between two lithospheric plates moving past each other
ocean-ocean subduction
the first type of convergent plate boundary, where one lithospheric plate subducts under the other
ocean-continent subduction
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)
continent-continent subduction
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)
volcanic arc
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)
San Andreas Fault
the most famous example of a transform boundary several hundred kilometers long