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Where an oceanic plate descends beneath a continental one, the rock it carries does not simply me. Rising pressure and temperature rear its minerals into denser forms without ever producing a li, a process geologists call metam. Water bound in the sinking crust is gradually rel, and that water lowers the melting point of the overlying ma, generating magma that eventually fe volcanoes at the surface. The chain therefore runs in one dire: subduction drives dehydration, dehydration drives melting, and melting sus the arc. Interrupting any link en the volcanism above it.