Which primary mechanism allowed Inca terrace farming systems to prevent topsoil loss on steep Andean slopes?

💡 Explanation

When terraces are constructed on steep slopes, stepwise reduction of slope length occurs because physical barriers interrupt uninterrupted downhill flow leading to decreased erosion rate, mitigating nutrient loss. Therefore slope reduction primarily prevents topsoil loss through reduced water flow rather than other mechanisms affecting chemical enrichment or soil chemistry.

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