Which risk increased during the construction of Inca dry-stone masonry walls at high altitudes?

💡 Explanation

Freeze-thaw cycles posed a significant threat, causing water trapped in microscopic pores to expand upon freezing, exerting pressure via ice wedging that leads to fracturing, because the mechanism weakened already vulnerable structural elements. Therefore, fracturing risk increased, rather than other geographically stable structural risks like creep.

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