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Which structural risk increases for water channels featuring 'pietra dura' inlay during winter?

A)Material ablation from increased sediment
B)Cracking from freeze-thaw weathering
C)Increased turbulence decreasing flow rate
D)Biological contamination exceeding acceptable limits

💡 Explanation

Increased cracking risk occurs via ice lens formation because differential thermal expansion leads to tensile stress exceeding the material's fracture toughness. Therefore, 'freeze-thaw weathering' is likely, rather than flow reduction or sediment abrasion which are influenced by flow dynamics.

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