Which consequence results from terrace farming impacting soil nutrient retention in ancient Andean agriculture?

💡 Explanation

When terrace farming's drainage systems are inadequate, concentrated water runoff erodes topsoil because gravitational flow increases in channeled paths, contributing to downstream gully erosion. Therefore increased downstream gully erosion results, rather than decreased yields, enhanced carbon sequestration, or groundwater leveling that require different geographical or material conditions.

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