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← GeographyWhich risk increases when rapid groundwater extraction lowers the water table within a soluble bedrock formation containing existing sinkholes?
A)Increased sinkhole collapse frequency✓
B)Decreased surface runoff velocity
C)Enhanced aquifer recharge capacity
D)Reduced seismic wave amplification
💡 Explanation
Increased collapse occurs because the decreased pore water pressure within the bedrock leads to reduced structural support and increased effective stress on the already weakened sinkhole structures via mechanical weathering. Therefore, collapse is more likely rather than increased stability because of the reduced pore water pressure.
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