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← HistoryWhich consequence results when materials weather in dry stone Inca bridges?
A)Arch keystone displacement occurs✓
B)Cable anchoring points fail
C)Sustained creep deformation decreases
D)Masonry friction reduces settling
💡 Explanation
Arch keystone displacement occurs because freeze-thaw cycles cause differential stresses at joints, affecting arch integrity, a form of Mechanical Weathering. This weakens joints weakening the load capacity; therefore, keystone integrity is threatened rather than strengthened by consolidation.
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