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23 Cards in this Set

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