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Geography

Which mechanism increases slope instability when hillside permafrost thaws due to climate change?

A)Cryogenic suction causing ground collapse
B)Formation of thermokarst accelerating erosion
C)Vegetation die-off triggering landslides
D)Decreased surface friction reducing stability

💡 Explanation

When permafrost thaws, thermokarst formation occurs because frozen ground destabilizes into irregular terrain featuring depressions as ice melts, accelerating erosion from runoff and mass wasting processes. Therefore, heightened thermokarst formation increases slope instability, rather than cryogenic suctioning related collapse, reduced surface friction, or related vegetation die-off causing landslides as the primary thaw mechanisms.

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