Which soil stabilization mechanism was critical for the effective use of terraced agriculture in the Inca empire?

💡 Explanation

When constructing terraces, andesite stone walls provided counter-force against soil creep because the Inca terraces were built on steep slopes with unstable soils, requiring retaining walls to manage erosion. Therefore, stone reinforcement becomes beneficial, rather than manure, trenches, or traffic management, which have alternative effects elsewhere.

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