Which phenomenon impacts regional climate when subduction introduces water into Earth's mantle?

💡 Explanation

When subduction introduces water into the mantle, the melting point of mantle rock decreases because hydration lowers the solidus, which forms magma with higher volatile content increasing the likelihood of explosive volcanic eruptions that eject aerosols impacting climate. Therefore increased volcanic potential changes climate, rather than carbon cycles, ocean circulation, or atmospheric thermodynamics that are influenced by other processes.

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