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← GeographyWhich risk increases when water table drawdown lowers buoyant support in subterranean karst regions overlying urban infrastructure?
A)Accelerated surface subsidence and sinkhole formation✓
B)Increased fracture density in igneous bedrock
C)Regional increase in acid precipitation rates
D)Reduced effectiveness of urban green spaces
💡 Explanation
Drawdown weakens support causing surface collapse because the buoyant support reduces mechanical stress from overburden. Therefore, sinkhole formation is accelerated rather than increasing fractures or acidity which have different underlying causes.
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