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← HistoryWhich risk increases for pietra dura in Mughal gardens when exposed to constant direct sunlight?
A)Adhesive mortar drying becomes brittle
B)Differential thermal expansion causes cracking✓
C)Salt efflorescence weakens stone matrix
D)Algae growth accelerates material decomposition
💡 Explanation
Differential thermal expansion induces stress because heat causes varying expansion rates in the different inlaid stones. This increase in stress leads to cracking; therefore, structural integrity is jeopardized rather than simpler mortar drying or biological activity alone.
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