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← GeographyWhich mechanism primarily causes catastrophic sinkhole formation in coastal regions above fractured limestone aquifers?
A)Dissolution enhanced, buoyant fracturing✓
B)Overburden pressure surpasses aquifer strength
C)Sediment infill, reduced particle cohesion
D)Hydraulic head induces cementation failure
💡 Explanation
Buoyant fracturing worsens sinkhole formation because dissolution weakens limestone; buoyant forces then exert upwards pressure, furthering fracturing. Therefore, instability arises rather than from sediment compaction or simple overburden pressure exceeding layer strength in some instances.
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