Which effect accompanies stratovolcano formation where subducting oceanic crust hydrates the mantle wedge?

💡 Explanation

When subducting oceanic crust hydrates the mantle wedge, the addition of water lowers the melting point of mantle rocks, generating magma beneath stratovolcanoes. This magma tends to be rich in silica and dissolved gases, leading to explosive eruptions due to elevated magmatic viscosity. Therefore, a high magma viscosity results, rather than reduced emissions, fluid lava flows, or decreased activity, which depend on different magmatic or tectonic conditions.

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