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Which risk intensified with the emergence of larger, more elaborate dry-stone retaining walls used during the Inca empire?

A)Hydrostatic pressure behind wall
B)Differential thermal expansion cracking
C)Salt weathering compromising stability
D)Seismic liquefaction foundation failure

💡 Explanation

Hydrostatic pressure risk increased because poor drainage allowed water to accumulate behind the massive walls during El Niño events promoting instability via lateral FORCE IMBALANCE, therefore wall collapse occurred rather than controlled deformation under stable conditions.

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