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← GeographyWhich geomorphic outcome accelerates when thermokarst destabilizes Arctic hillslope permafrost?
A)Increased frequency of retrogressive thaw slumps✓
B)Stabilization of the active layer depth
C)Reduced methane outgassing rates yearly
D)Decreased rates of coastal bluff erosion
💡 Explanation
Retrogressive thaw slumps increase from hillslope destabilization related to thermokarst through the mechanism of thermal erosion, because permafrost thaw undercuts the slope via heat transfer, rather than stabilizing or reducing other climatic impacts; therefore, it triggers more failures.
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