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An ancient fragment of the Pacific Ocean found buried 400 miles below China



Scientists have identified an old piece of the Pacific Ocean – the ancient remains of its ancient seabed – stretching hundreds of miles below China as it is pulled down into the transitional zone of the Earth’s mantle.

This rocky plate, which once lined the bottom of the Pacific Ocean, is a relic of the oceanic lithosphere, the outermost layer of the earth’s surface, composed of the crust and hard outer parts of the upper mantle.


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