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continental drift vs. plate tectonics

[ kon-tn-en-tl drift ]
  1. the lateral movement of continents resulting from the motion of crustal plates.
[ pleyttek-ton-iks ]
  1. a theory of global tectonics in which the lithosphere is divided into a number of crustal plates, each of which moves on the plastic asthenosphere more or less independently to collide with, slide under, or move past adjacent plates.

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