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← GeographyWhich risk increases when roads are constructed across regions with active solifluction?
A)Pavement cracking from differential settling✓
B)Asphalt degradation from chemical de-icers
C)Increased vehicle accidents during thawing
D)Bridge collapse after seasonal flooding
💡 Explanation
When roads are built on solifluction slopes, differential settling occurs because the active layer thaws and flows unevenly across the permafrost table, leading to instability under the roadbed. Therefore, pavement cracking increases, rather than de-icer degradation, accident risk, or bridge failures, which are driven by distinct mechanisms.
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