Thirsty crystals The deep Earth holds about the same amount of water as our oceans. That’s the conclusion from experiments on rocks typical of those in the mantle transition zone, a global ...

While studying the planet's layers deep beneath Bermuda, scientists found evidence of volcanic material rising from the mantle's transition zone, located 250 to 400 miles beneath Earth's crust.

They found a sharp discontinuity, or change in the speed of seismic waves, within the mantle at a depth of 410 miles (660 kilometers), or the bottom of the transition zone between the upper and ...

The Earth's mantle transition zone contains water locked up in minerals — enough to rival the oceans on the surface of the planet.