Which slope instability risk increases significantly as permafrost thaws in subarctic regions?

💡 Explanation

When permafrost thaws, the active layer above becomes saturated and loses its shear strength, initiating solifluction because the soil mass slowly flows downslope. Therefore, solifluction increases, rather than creep decreases, rockfall decreases, or cohesion increases, which require frozen conditions or specific soil structures.

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