First off, it's 3x the volume of the oceans, so we're still just looking at a whopping 4% of the total Earth's volume.
Second, it isn't liquid water like on the surface. It's water molecules trapped inside rock. If the ringwoodite's pressure drop fast enough to release the H2O molecules you'd get caustic chemicals, not pure water.
Second, it isn't liquid water like on the surface. It's water molecules trapped inside rock. If the ringwoodite's pressure drop fast enough to release the H2O molecules you'd get caustic chemicals, not pure water.
