Discovery of Earth's Subsurface Ocean

What lies below the Earth's surface? The crust?

The mantle filled with hot lava? The deep and bubbling hot

core?

Yes, all of that is true, but there is also something else there.

Scientists have found an ocean under the Earth's surface,

a massive one at that.

Sounds staggering, right?

Let me tell you all about it.

The discovery has been made some seven hundred kilometers deep into the

Earth. The ocean lies just above the lower mantle

in

something called the mantle transition zone.

The water is present in a rock known as ringwoodite.

And do you know how big this ocean is?

About three times the volume of all the planet's oceans

combined. So if you take all of the Earth's oceans

and triple them,

that is the amount of water discovered inside the Earth.