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16 Cards in this Set

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plate tectonics
plate tectionics is a theory that discribes contintental movement and proposes a possible explanation of why and how continents move.
oceanic crust
material on the ocean floor forms oceanic crust
continental crust
continental crust makes up the continental landmasses
lithosphere
the oceanic and continental crust and the rigid upper mantle
asthenosphere
a layer of plastic rock that is solid rock that slowly flows (like putty) when under pressure
divergent boundary
boundary formed by two lithospheric plates that are moving apart
rift valley
narrow valley formed as the plates seperate in the center of a mid-ocean ridge
convergent boundary
border formed by the direct collision of two lithospheric plates
subduction zone
the region along a plate boundary where one plate moves under another plate
ocean trench
deep valley in the ocean floor that forms along a subduction zone
island arc
part of the subducted plate melts, and the resulting molten rock rises to the surface along the trench to form a chain of volcanic islands
transform fault boundary
a plate boundary that forms where two plates are grinding past each other. The plate edges usually do not slide along smoothly.
convection
the transfer of heat through the movement of heated fluid material.
convection current
this cycle of warm water rising and cool water sinking to replace it
theory of suspect terranes
theory that continents are a patchwork of pieces of land that have individual geologic histories
terranes
pieces of lithosphere, each with its own distinct geologic history.