Which undesirable outcome threatens an ancient Roman aqueduct running through seismically-active terrains?

💡 Explanation

Aqueduct keystone displacement results from ground movement during seismic events, implementing shear stress because the blocks are dry-laid with no mortar. The structural integrity is therefore breached, rather than water quality deteriorating or inefficiencies occurring.

• Which communication failure increases when an Incan quipu lacks standardized knot spacing?
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• Which outcome occurred if medieval sailyards faced persistent strong winds?
• Which outcome occurs when hygroscopic salts contaminate the tesserae binding in Byzantine mosaics?
• Which limited resource caused increased terracing amongst the Inca?