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← GeographyWhich consequence results when prolonged drought lowers subterranean water tables within karst regions overlying fractured limestone?
A)Accelerated gypsum formation expands cavern ceilings
B)Surface subsidence increases localized sinkhole frequency✓
C)Increased hydraulic head inhibits speleothem growth
D)Enhanced pore fluid pressure reduces sediment loading
💡 Explanation
Increased sinkhole collapses occur because lowered water tables remove buoyant support; void spaces enlarge due to mechanical COMPACTION. This leads to surface subsidence and new sinkhole formation rather than preventing ground deformation because of internal support.
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