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 early history is undergoing a quiet revolution. Long assumed to be dry at its core, new research suggests our planet may have formed with a massive internal water reservoir—locked deep within ...

Our Earth is structured sort of like an onion – it’s one layer after another. Starting from the top down, there’s the crust, which includes the surface you walk on; then farther down, the mantle, ...