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Which failure occurs when subsidence undermines Byzantine mosaic foundations?

A)Tesserae detach due to differential stress
B)Mortar crumbles through excessive vibration
C)Grout discolors under thermal expansion
D)Adhesive softens due to humidity cycling

💡 Explanation

Differential stress leads to tesserae detachment because ground shifts unevenly beneath the mosaic's rigid structure; this causes tension between individual tesserae and weakens their bond with the mortar. Therefore, detachment is the outcome, rather than progressive mortar crumbling or grout discoloration linked to other environmental factors.

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