Which outcome resulted from the collapse of terrace walls in pre-Columbian Andean agriculture after El Niño events?

💡 Explanation

When terrace walls collapse from intense El Niño rainfall, accelerated soil erosion occurs because the retaining structures are no longer in place, leading to increased sedimentation downstream and loss of arable land. Therefore increased erosion results, rather than fertilization, pest reduction or improved infiltration which require stable well-maintained systems.

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