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← GeographyWhich outcome occurs when increased water content alters mantle viscosity above subduction zones?
A)Increased explosive volcanic eruption frequency✓
B)Decreased frequency hotspot island formation
C)Higher rates strike-slip fault aftershocks
D)Elevated intensity of glacial isostatic rebound
💡 Explanation
Increased mantle water content reduces viscosity, fostering magma ascentvia buoyancy. Therefore, explosive volcanic eruptions happen more frequently, because magma rises easier and traps more gases, rather than reduced hotspot activity, which relates to mantle plumes.
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