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12 Cards in this Set

  • Front
  • Back
TRANSFORM FAULT
A boundary where planes slide past each other.
THEORY OF SEA FLOORS SPREADING
The idea that the mid-ocean ridge is a crack in the Earth's crust through which milten rock rises and spreads as a new sea floor.
THOERY OF PLATE TECTONICS
The idea that the Earth's lithosphere is a break in moving plates.
THEORY OF CONTINENTAL DRIFTS
The idea that the continents were once together and then broke apart and moved into their present position.
SUBDUCTION
The process by which one plate is pushed below another.
RIFT VALLEY
A deep, narrow valley.
PLATES
Rigid blocks of the Earth's outer crust.
PANGEA
A large mass that broke apart forming the continents.
MID-OCEAN RIDGE
The continuous chain of mountains on the floor of major oceans.
DIVERGENT BOUNDARY
The place where two plates move apart.
CONVERGENT BOUNDARY
A place where two plates come together.
ASTHENOSPHERE
A zone in the upper mantle on which the plates float.