
Hidden Deep-Earth Ocean Could Triple Earth's Water
Scientists report a vast, bound water reservoir about 700 km below the surface, stored in the mineral ringwoodite in the mantle's transition zone. Using seismic data from roughly 2,000 stations and 500 earthquakes, they estimate this deep ocean could contain about three times as much water as all surface oceans, suggesting Earth's water partly originates from within and that the deep cycle helps keep surface oceans stable over geological time.












