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← HistoryWhich risk increases when a Viking rope bridge's anchoring points experience repeated wetting and drying?
A)Material's tensile strength increases slightly
B)Torsional forces quickly abate upstream
C)Hydrostatic pressure reverses quickly
D)Material fatigue accelerates substantially✓
💡 Explanation
Material fatigue accelerates because the repeated wetting and drying accelerates corrosion on the rope and its fasteners, inducing cyclical stress. Therefore, the bridge weakens dramatically, rather than hydrostatic reverses, because the iron or wood material degrades cyclically.
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