Earth’s deep interior may hold water equal to today’s oceans, challenging long-held views of how the planet became habitable.

Far below the familiar blue of the oceans, scientists are uncovering evidence of a vast hidden reservoir of water locked inside the rocks of Earth’s mantle. Rather than a single underground sea, this ...

Earth’s deep interior still shapes the world above your feet. Water trapped far below the surface helps control how rocks move, melt, and recycle through the mantle. Some of that water carries a ...

When Earth was a molten inferno, water may have been locked safely underground rather than lost to space. Researchers discovered that bridgmanite deep in the mantle can store far more water at high ...

Satellites detected a mysterious gravitational change beneath Earth's surface, suggesting rapid movement of interior masses.