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Geography

Which risk increases when a rhyolitic lava dome nears collapse?

A)Increased frequency of pyroclastic flows
B)Elevated rates of regional subsidence
C)Decreased atmospheric methane concentration
D)Enhanced stability of surrounding slopes

💡 Explanation

Pyroclastic flows increase under such conditions because gravitational potential energy will trigger the mechanism of slope failure, which releases buoyant gases and pyroclastics rather than causing slope reinforcement. Therefore, pyroclastic flows result rather than slope stabilization.

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