Which mechanism intensifies volcanic eruption explosivity when subducting slab dehydrates?

💡 Explanation

When a subducting slab dehydrates, water is released into the overriding mantle wedge causing flux melting because the water lowers the melting point of the mantle rock, leading to increased magma production and higher silica content. Therefore, magma's viscosity increases, fostering explosive eruptions, rather than other processes which depend on magma cooling, pressure changes, or external contamination.

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