Which outcome occurs due to seasonal Mesopotamian river siltation?

💡 Explanation

Reduced crop productivity follows because, over time, silt accumulation decreases *channel capacity*, increasing flood risk and decreasing water reaching fields; therefore long-term yields drop, rather than increase by constant nutrient replenishment and better transport efficiency from cleared channels.

• When early Chinese iron bridges experienced sag under load, which mechanism critically delayed their structural failure versus similar timber spans?
• Which consequence arose from the limitations in astrolabe precision during medieval navigation?
• Which constraint limited Roman road construction across unstable marshland during the Republic era?
• Which structural effect challenged early steam locomotive designs lacking effective suspension systems?
• Which outcome accelerates in early Bronze Age blade production due to repeated forging?
• Which risk to ziggurat stability escalates when subsidence occurs unevenly?