Water-rich diamonds hint of vast 'oceans' deep inside Earth
An international team of researchers have found inclusions of ice-VII, a high-pressure form of water, in diamonds at a depth of 410-660 km. The discovery points towards aqueous pockets around the region called transition zone in the mantle, said researchers. Previous discoveries of water-rich minerals from the region have claimed that the "Earth's mantle holds an ocean's worth of water."