Quote:
Originally Posted by rodin
Well assuming the model of subduction is correct (there seems to be some debate about this) the obvious answer is as a result of the subsequent reduction in Earth diameter. And perhaps in addition to expansion then contraction there are eddy currents. The 2 are not mutually exclusive.
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Subduction zones and divergent boundaries are well understood and explain well how the tectonic plates move causing the separation of the continents. I don't see why your idea should explain it any better?