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← GeographyWhich outcome occurs when rapid groundwater extraction lowers the potentiometric surface in karst regions?
A)Increased frequency of sinkhole formation✓
B)Enhanced river channel incision
C)Decreased aquifer recharge rates
D)Stabilization of subsurface cave systems
💡 Explanation
Increased loading leads to sinkhole formation, because the decreased hydraulic head reduces support from hydrostatic pressure; Pipe collapse occurs as sediment is winnowed, therefore overburden collapse becomes dominant, rather than stable hydrostatic support alone.
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