Which outcome occurred when unreinforced terrace walls saturated with water, experienced freeze-thaw cycles in the Andes?

💡 Explanation

When unreinforced terrace walls saturated with water undergo freeze-thaw cycles, ice lenses form, expanding the soil resulting in cryoturbation, eventually causing the wall to fracture and collapse, initiating debris flow and slope instability. Therefore, debris flow ensues rather than yield increase, plant growth, or reduced infestation, which require different environmental or biotic interactions.

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