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← HistoryWhich outcome results when the Roman vallus weakens an aqueduct?
A)Water outflow will irregularly fluctuate
B)Structural failure during thermal expansion✓
C)Increased potable-water lead contamination occurs
D)Elevated biological algae propagation emerges
💡 Explanation
Structural failure from thermal expansion occurs because a vallus, weakening the stone, reduces the tolerance for seasonal temperature shifts that create additive stress; therefore, the aqueduct collapses, rather than causing immediate flow issues or algae growth patterns.
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