Scientists discover Earth's hidden ocean
A recently published theory adds a layer beneath the Earth's crust previously thought to be nonexistent.
Get ready to re-think everything you learned about the Earth's geography.
Geophysicist Steve Jacobsen of Northwestern University published a study in Science explaining a new theory — that below the Earth's surface is a massive reservoir with three times as much water as all of the oceans combined.
The theory is that trapped water lies in crystal-structured rocks beneath the Earth's crust — the thin layer of continents and oceans — dismantling the popular theory that the crust lies atop what is known as the mantle, the hot liquid layer that surrounds the Earth's inner and outer nickel and iron core.
The theory also explains where the Earth's water came from, countering the arguments that icy comets deposited water.
The study used data from instruments that measure earthquake vibrations, combining the information with rock experiments.