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← HistoryWhich consequence happened when the mortar degraded within Inca stone walls?
A)Masonry experienced increased seismic vulnerability✓
B)Sections became waterproof above threshold
C)Terraces experienced excessive algal blooms
D)Quipu color dyes significantly faded quickly
💡 Explanation
Seismic vulnerability increased due to reduced wall cohesion. The mechanism is increased frictional slippage because weakened mortar no longer bound stones together. Therefore, seismic pressures caused movement rather than staying structurally sound resisting shear in uniform distribution above a threshold.
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