The rare diamonds suggest that water is hidden much deeper in the Earth’s interior

A rare type of diamond may suggest that water may penetrate deeper into the Earth’s interior than scientists previously thought.

Although more than 70% of our planet is covered in water, there is also water in minerals more than 200 miles (322 kilometers) below the earth, including in the upper mantle, the semi-ductile layer in which the crust “floats.” Scientists have long believed that as the upper mantle transitions into the warmer, denser lower mantle, the minerals can hold much less water.

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