Which long-term consequence arises when high-sulfur coal combustion gases react with the marble inlay of historical Mughal monuments?

💡 Explanation

Gypsum crusts form because sulfur dioxide in combustion gases reacts with calcium carbonate in marble via Atmospheric deposition and sulfur oxidation, forming calcium sulfate (gypsum). This leads to the slow buildup of gypsum, rather than abrasion, changed conductivity, or tensile stress.

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