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What caused the mechanism of Plate Tectonics to begin?

  1. Sep 3, 2013 #1
    Billions of years ago, something must have triggered rifts and the seperation of the first landmasses into the first tectonic plates? Do we know what happened, when or how, and what Earth would have looked like at the time? Could water have played a part in this and to what degree? I'm genuinely curous about this, so I hope someone can help here. Thanks.

  2. jcsd
  3. Sep 3, 2013 #2


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