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← GeographyWhich consequence results when excessive groundwater extraction lowers the water table beneath an alluvial aquifer?
A)Increased aquifer compaction and subsidence✓
B)Enhanced sediment transport to the ocean
C)Accelerated chemical weathering of minerals
D)Decreased frequency of flash flood events
💡 Explanation
Aquifer compaction and subsidence increase because pore water pressure, which once supported the alluvial sediment structure, decreases under the mechanism of effective stress; therefore, the aquifer collapses under increased load, rather than maintaining volume like an unconfined situation.
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