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(Phys.org)—A team of researchers affiliated with several institutions in Japan and Germany has found evidence that suggests the middle of Earth's mantle holds as much water as the planet's oceans. In their paper published on the open access site Science Advances, the group describes their theory and their experiments to try to prove them correct.
Read more at: phys.org...
By adjusting the amount of water added to their synthetic mantle and calculating changes in viscosity, they were able to estimate how waterlogged the real-world minerals are. They then used that information to calculate how much water is in the entire mid-mantle. They report that it is very nearly equal to the amount of water in all of the world's oceans.
Read more at: phys.org...
This is because the mid-mantle is dominated by the minerals wadsleyite and ringwoodite, which are known to be able to hold a lot of water.