Which risk increases when an ancient Incan agricultural terrace experiences prolonged saturation from heavy rainfall?

💡 Explanation

When a terrace is saturated, hydrostatic pressure increases because water fills the soil pores, increasing its load on the retaining wall and decreasing shear strength, leading to potential downslope collapse. Therefore collapse results, rather than nutrient depletion, reduced yield, or pest infestations which require different environmental change mechanisms.

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