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← GeographyWhich risk increases when groundwater extraction nears alluvial fans?
A)Induced seismic activity increases✓
B)Saltwater intrusion contamination spikes
C)Channel avulsion frequency doubles
D)Decreased atmospheric river intensity
💡 Explanation
Subsidence increases the risk of induced seismicity because decreasing pore fluid pressure causes increased effective stress along faults, stimulating fault slip initiation. This answer holds rather than increased avulsion, intrusion, or weather changes, which relate to different hydrogeological conditions.
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