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← GeographyWhich risk significantly increases in alluvial aquifers when over-extraction lowers the water table?
A)Increased arsenic concentration in groundwater✓
B)Accelerated rates of clathrate dissociation
C)Amplified seismic wave propagation range
D)Enhanced bioaccumulation of rare-earth elements
💡 Explanation
Over-extraction lowers the water table exposing arsenic-bearing minerals to oxidation via unsaturated flow processes. This is oxidation because oxidation reactions increase arsenic ion mobilization, therefore, arsenic concentrations rise rather than remaining stable due to saturation.
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