The ancient piece of the Pacific Ocean is found buried 400 miles below China

Scientists have identified an old piece of the Pacific Ocean – an ancient remnant of a beach long before that – that stretched a few miles beneath China as it pulled down into the Earth’s transition zone.

This rocky slab, used to mark the lower part of the Pacific Ocean, is a remnant of the lithosphere of the ocean, the outermost layer of the earth’s surface, composed of the upper part of the crust and the hardest outer parts of the upper crust.

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