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← GeographyWhich consequence results when water ingresses subduction zone volcanoes?
A)Hydration of olivine within mantle wedge
B)Increased eruption explosivity at surface✓
C)Enhanced mantle convection cell development
D)Decreased geothermal gradient at depth
💡 Explanation
Phreatomagmatic eruptions become more likely because water lowers magma viscosity, increasing volatile release rate via flash vaporization. Therefore, eruptions become explosive rather than effusive, owing to violent expansion.
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