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← GeographyAfter permafrost thaw in cold terrain, which mechanism causes soil liquefaction-driven building subsidence?
A)Loss of interstitial ice cementation✓
B)Increased surface evapotranspiration rates
C)Reduced thermal ground conductivity
D)Accelerated chemical weathering processes
💡 Explanation
When permafrost thaws, the ice that cements soil particles melts; this loss of interstitial ice cementation reduces soil shear strength, because the soil matrix destabilizes, therefore leading to potential subsidence rather than changes in evapotranspiration or conductivity.
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