Historic fragment of the Pacific Ocean discovered buried 400 miles beneath China

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Scientists have recognized an previous piece of the Pacific Ocean – the traditional stays of its long-ago seabed – extending a whole lot of miles beneath China, as it’s pulled downward into Earth’s mantle transition zone.

This rocky slab that used to line the underside of the Pacific is a relic of the oceanic lithosphere, the outermost layer of Earth’s floor, composed of the crust and the strong outermost components of the higher mantle.

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