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plate tectonics : 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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the lateral movement of continents resulting from the motion of crustal plates.
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Pangaea :the hypothetical landmass that existed when all continents were joined, from about 300 to 200 million years ago.