Which outcome arises from cumulative terrace creep on ancient Inca agricultural hillsides?

💡 Explanation

Progressive soil accumulation occurs downslope due to terrace creep via a ratchet mechanism, because soil slowly shifts downhill with each freeze-thaw cycle. Therefore, terraces sag downslope over many seasons, rather than uniformly stabilizing; alternatives involve less erosion.

• Which vulnerability critically undermined Roman siege towers during protracted sieges?
• Which navigation error increases as wind loading exceeds the displacement tonnage during 18th-century navigation?
• Which risk was magnified when Viking longships encountered rapid tidal changes?
• Which outcome resulted from medieval Islamic scholars' advancement of algebra to solve inheritance problems according to Sharia law?
• Which irrigation-related consequence arose when Tenochtitlan's *chinampas* exceeded optimal density?
• Which outcome directly resulted from Byzantium's sericulture monopoly in medieval Europe?