Which risk increased along Hadrian's Wall when the mortar degraded?

💡 Explanation

Reduced bond strength of the lime mortar increases collapse risk because the key mechanism securing the wall shifts from distributed compression to localized shear stress. Therefore, collapse probability rises, rather than salt issues or undermining.

• Which outcome occurred in early Mughal gardens when a channel's settling tank was undersized during the rainy season?
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• Which longevity bottleneck arises because iron sulfide inclusions form within Byzantine glass mosaic tesserae?
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