Which outcome regularly occurred in Incan terrace farming when poorly designed qochas (reservoirs) were placed above active terraced plots?

💡 Explanation

Increased risk of topsoil erosion occurs when qochas fail because the weight of standing water generates excess pore pressure inside the earthen dam, causing slope instability and soil liquefaction. Therefore eroded topsoil flows downward, rather than nutrients concentrating upward.

• Which outcome most immediately impaired the structural integrity of besieged castle walls bombarded by Roman stone throwers (ballistae)?
• Which phenomenon limited Ming Dynasty cast iron cannon durability?
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