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Which outcome accelerated the failure of Inca agricultural terracing built upon unstable mountain slopes?

A)Creep caused down-slope terrace movement
B)Oxidation weakened retaining wall stones
C)Subsidence crushed the foundations
D)Erosion exposed buried aqueducts

💡 Explanation

Slope instability, driven by internal deformation (creep), led to a gradual downslope movement of terrace structures because creep is the slow, permanent deformation under stress, rather than sudden failures or material property changes.

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