Which benefit occurred when pre-Columbian Andean terraces implemented stone-faced retaining walls on steep slopes?

💡 Explanation

When stone-faced retaining walls were implemented, they caused reduced soil erosion because the structures physically blocked downhill soil movement by intercepting the water and sediment flow. Therefore decreased soil erosion resulted, rather than fixing nitrogen, pesticide application, or genetic diversity which rely on unrelated agricultural approaches.

• Which mechanism allowed Mayan architects to create corbelled arches without true keystones?
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• Which issue critically limited early Mesopotamian bronze tools where river sediment was highly abrasive?
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• Which structural risk increased when iron replaced wood in 19th-century ship hulls experiencing hogging forces in heavy seas?