Which thermal consequence arises where oceanic crust subducts beneath continental crust?

💡 Explanation

During subduction, the descending oceanic plate releases water into the mantle wedge, lowering the melting point and triggering partial melting because of hydration and decompression, leading to magma plumes that ascend and form a volcanic arc above the subduction zone. Therefore a volcanic arc results, rather than increased gradient, decreased convection or crustal thinning, which require different geological settings.

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