Which primary structural challenge did Mesopotamian engineers face during ziggurat construction regarding soil liquefaction?

💡 Explanation

When the saturated soil beneath a ziggurat experienced dynamic loading during floods or seismic events, soil liquefaction would occur, because the effective stress reduces and the soil loses its shear strength, leading to differential settling. Therefore uneven settlement resulted, causing structural instability, rather than thermal cracks, foundation slip, or wind resonance, which involve independent environmental conditions.

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