Okayama University researchers have discovered that major minerals in the Earth's deep mantle were nearly dry, challenging previous assumptions about the presence of water in the planet's interior. The findings, published in a recent scientific study, suggest that water in the deep Earth may have a different origin than previously thought. Using advanced analytical techniques, the team examined samples of mantle minerals and found that they contained only trace amounts of water, indicating that the deep Earth may have been largely dry during its formation. This discovery could have significant implications for understanding how water is distributed within the Earth and how it contributes to geological processes. The research was conducted by a team of geologists at Okayama University, who used high-pressure and high-temperature experiments to simulate conditions in the deep mantle. Their results provide new insights into the role of water in planetary evolution and may influence future studies on Earth's geochemistry.