When did plate tectonics start?
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❥"There have been several very different views on when modern-like plate tectonics started," said Tomas Naeraa, a researcher at the Geological Survey of Denmark and Greenland who led the study. "It was clear from our data that there was a transition 3.2 billion years ago, and rocks formed after that could be related to plate tectonic processes."
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3.2 billion years ago.
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