A study found that plate tectonics were triggered by intense bombardment of meteors 3.2 billion years ago -transforming the hot, primordial mushy surface into the present rugged landscape.
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Extra-terrestrial impacts may have shaped Earth 3.2 billion years ago, study finds
![Extra-terrestrial impacts may have shaped Earth 3.2 billion years ago, study finds]()
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November 27, 2019
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