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23 Cards in this Set
- Front
- Back
continental drift
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continents had moved
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Pangaea
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the single land mass of continents
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Panthalassa
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huge ocean surround single land mass of continents
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Mid-Atlantic ridge
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an undersea mountain range witha a steep, narrow valley running down its center
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mid-ocean ridges
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all the undersea mountain ranges put together
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seafloor spreading
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movement of the ocean floor away from either side of a mid ocean ridge
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normal polarity
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rocks with magnetic field pointing north
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reverse polarity
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rocks with magnetic fields pointing south
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oceanic crust
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crust that the oceans lie on
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continental crust
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makes up continental landmasses
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plate tectonics
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the theory of continental drift and seafloor spreading
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asthenosphere
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beneath the lithosphere
solid rock that can flow |
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divergent boundary
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2 plates moving away from each other
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rift valley
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the narrow valley formed as plates separate in a mid-ocean ridge
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convergent boundary
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the direst collision of one plate with another
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subduction zone
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the region along a plate boundary where 1 plate moves under another
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ocean trench
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generally forms along a subduction zone
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transform fault boundary
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2 plates grind past each other
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island arc.
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a chain of volcanic islands
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convection
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the transfer of heat through the movement of heated fluid material
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convection current
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the cycle of warm water rising and cool water sinking to replace it
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theory of suspect terranes
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continents are actually pieces of lithosphere, each with its own distinct geological history
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terranes
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pieces of lithosphere
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