Hidden Ocean Beneath Earth's Crust Holds More Water Than Surface

Scientists have discovered a massive ocean beneath the Earth's crust, stored in a mineral called ringwoodite, which contains three times more water than all the surface oceans combined. This finding, based on seismic data, suggests a whole-Earth water cycle and explains the abundance of surface water. The discovery highlights the unique properties of ringwoodite, which can trap water in a sponge-like state, and adds to recent significant scientific discoveries.