Which outcome arises when a subducting oceanic plate hydrates the mantle wedge above at a convergent boundary?

💡 Explanation

When a subducting plate hydrates the mantle wedge, the added water lowers the mantle's melting temperature because it disrupts the silicate network, provoking partial melting and magma formation. Therefore a lower melting temperature results, rather than increased silica, reduced crystallization or elevated viscosity which require anhydrous conditions.

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