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Which outcome occurs when heavy rainfall saturates poorly compacted fill within a pre-Columbian agricultural terrace system?

A)Terrace wall bulging and collapse
B)Reduced crop yield from nitrogen leaching
C)Enhanced root growth due to increased moisture
D)Improved drainage preventing waterlogging

💡 Explanation

When rainfall saturates uncompacted fill, increased hydrostatic pressure from water weight causes soil deformation leading to slope instability, triggering terrace wall bulging and collapse. Therefore, structural failure occurs, rather than improved yield, root growth, or drainage control which require stable, well-engineered backfill.

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