Magma formation at convergent plate boundaries is caused by: O frictional heating as the subducting plate rubs against the overlying plate O the evaporation of water in the subducting plate which produces steam that infuses rock in the overlying plate and lowers its melting temperature O the drop in pressure experienced by rising hot mantle rock O anomalously high concentrations of radioactive isotopes of uranium, thorium, and potassium that generate large amounts of heat O increased temperatures generated by compression of the two colliding plates

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