Which risk increases due to soil instability in historical Andean terraced fields during prolonged intense rainfall?

💡 Explanation

When soil becomes saturated during intense rainfall, increased pore water pressure reduces effective stress, causing soil weakening and shear strength reduction leading to landslides along terrace walls. Therefore, slope failure is the primary risk, rather than nutrient runoff, pest infestations or soil compaction issues which occur through other mechanisms and at a slower pace.

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