Which risk increases when poorly compacted soil is used in ancient terraced irrigation systems?

💡 Explanation

When soil is poorly compacted, seismic activity or saturation can induce soil liquefaction because water pressure increases between particles, reducing effective stress and causing the soil to behave like a liquid. Therefore structural collapse results, rather than erosion, salinization, or silt buildup, which depend on different factors like surface gradient and water chemistry.

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