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← GeographyWhich slope failure accelerates when freeze-thaw cycles increase water content in permafrost-affected soils?
A)Rockslides due to fractured bedrock
B)Solifluction due to thawed active layer✓
C)Creep from gradual soil displacement
D)Slumps caused by rotational shear
💡 Explanation
When freeze-thaw cycles increase water content, solifluction is accelerated because this saturation reduces soil shear strength in the active layer, above the permafrost, causing downslope flow of saturated soil. Therefore solifluction results, rather than rockslides, creep, or slumps where varying mechanisms and geological conditions lead to slope failures.
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