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← GeographyWhich consequence results when thawing permafrost under hydraulic structures occurs?
A)Elevated reservoir sediment suspension loads
B)Accelerated methanogenesis in reservoir sediments
C)Subsidence undermining structural integrity✓
D)Increased downstream nitrogen mineralization
💡 Explanation
Thawing permafrost causes ground ice melt, leading to soil compaction via consolidation. The mechanism being thaw settlement. Therefore, infrastructure loses support, leading to subsidence, rather than simply altering water chemistry or sediment suspension.
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