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← GeographyWhich risk increases when a building constructed on permafrost causes thawing of ground ice at the foundation?
A)Differential settlement and structural damage✓
B)Increased CO2 flux caused by methanogenesis
C)Accelerated weathering of exposed concrete
D)Amplified seismic activity from tectonic rebound
💡 Explanation
When a building thaws permafrost, soil compaction occurs because melting ice reduces volume leading to uneven support and structural stress. Therefore differential settlement is a risk, rather than methanogenesis, weathering, or seismicity, which depend on different environmental conditions and mechanisms.
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