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Young and Restless: Ancient Earth shows moving crust

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7:39am, March 21, 2007

Tectonic movements of Earth's crust began at least 3.8 billion years ago, according to new evidence from the oldest known rock formation.

After Earth formed about 4.5 billion years ago, its cooling surface eventually developed continental plates and ocean basins that move as they do today. But scientists haven't known just when this transition to plate tectonics occurred.

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