Plate Tectonics Concept that the Earth's crust is composed of rigid plates that move over a less rigid interior.
[edit] Plate tectonics
On the longest time scales, plate tectonics will reposition continents, shape oceans, build and tear down mountains and generally serve to define the stage upon which climate exists.
continental drift"The movement of the continents relative to each other. Continental drift is a consequence of plate tectonics. Continents generally move with respect to each other at the rate of a few centimeters per year.
 See also: Ocean, Water, Current, Surface, Air
  
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