The crust of the earth which we all live, work, and play on has been recycled, according to a new study. The earth recycles its crust as it disappears into the mantle only to be forced back out again. Scientists studying the the Azores examined isotopes and realized the crust there is around 2.5 billion years old.
Meanwhile, the 3.8 billion old piece of crust in Greenland described the Azores crust as "cute."
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