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← HistoryWhich outcome resulted from seasonal silt deposits accumulating behind the retaining walls on ziggurats?
A)Reduced structural instability over time
B)Decreased need for drainage systems
C)Strengthened mortar between brick layers
D)Lateral force increasing wall stress✓
💡 Explanation
Lateral earth pressure increased on the ziggurat's walls because the silt accumulated and exerted hydrostatic pressure. This is the mechanism leading to stress. Therefore, the walls needed increased reinforcement, rather than decreased instability or strengthened mortar under compression.
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