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← GeographyWhich effect accelerates when a permafrost active layer experiences increased thawing and saturation?
A)Increased coastal cliff stability
B)Rapid solifluction lobe development✓
C)Decreased methane gas emissions
D)Enhanced lichen growth on slopes
💡 Explanation
When the active layer thaws and becomes saturated, reduction of soil shear strength promotes solifluction because the viscous mass flows downslope, accelerating lobe formation. Therefore lobe development results, rather than increased cliff stability, decreased methane, or enhanced plant growth that demand different soil characteristics and climatic forcings.
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