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Earth’s oldest crystals reveal age of plate tectonics – Space.com

The findings were buried beneath billions of years of Earth history.

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Earth’s constantly moving tectonic plates have created the unique habitable planet we recognize today.
A new study, led by geologist Michael Ackerson from the Smithsonian’s National Museum of Natural History in Washington has predicted that our planet’s tectonic plates large slabs of Earths crust lying over a liquid mantle began moving roughly 3.6 billion years ago, when Earth was just under one billion years old. 
Peering this far back into the planet’s ancient past requires studying material that…

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