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← HistoryWhich weathering outcome accelerates when acid rain compromises pietra dura's mortar?
A)Oxidation rate of metal threads
B)Embrittlement of supporting marble slabs
C)Increased salt expansion risk within✓
D)Reduced aggregate interlock strength
💡 Explanation
Increased salt expansion risk increases inside pietra dura in Mughal architecture because mortar's chemical breakdown via hydrolysis accelerates salt’s crystallization due to rising porosity created by capillary action; therefore salt expansion, rather than embrittlement, dominates within altered microstructure.
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