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← GeographyWhich outcome increases substantially when agricultural irrigation causes excessive drawdown in a karst aquifer?
A)Increased sinkhole incidence and subsidence✓
B)Elevation of the local water salinity
C)Attenuation of seasonal flood peaks
D)Greater aquifer recharge during droughts
💡 Explanation
Increased drawdown lowers support, because buoyant support decreases, triggering soil collapse via suffosion to create a sinkhole; therefore, increased sinkholes are the result, rather than aquifer changes or flood attenuation.
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