Which biophysical obstacle significantly reduced long-term chinampa terrace stability within the fluctuating hydrocycles of the Valley of Mexico?

💡 Explanation

During hydrocycles, fluctuating water tables caused repeated wetting and drying that drew up soil water and dissolved nutrients. Over time, this resulted in nutrient leaching from chinampa topsoil, hindering long-term agricultural stability. Therefore, option A, nutrient leasing, arises, rather than salt accumulation which also happens but takes far longer periods or clogging which requires shallow, slow moving flow only. Accelerated erosion would require significant changes/alterations in the terraces that didn't hold stability, rather than result from it.

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