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← GeographyWhich geological risk sharply increases during buoyant subduction?
A)Elevated explosive volcanic eruption frequency✓
B)Increased continental crust weathering rate
C)Decreased metamorphic rock formation events
D)Stronger deep-sea hydrothermal vent activity
💡 Explanation
More buoyant, less dense crust resists subduction, causing shallower plate angles, leading to increased magma viscosity and gas build up, triggering Volcanic Explosivity Index increase because shallower subduction causes greater volatile content, therefore more explosive eruptions, rather than other gradual processes.
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