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Which outcome accelerated the degradation specifically affecting pietra dura inlay within Mughal-era sandstone structures?

A)Increased groundwater acidity dissolves carbonates
B)Freeze-thaw cycles created cracking
C)Differential thermal expansion strained interfaces
D)Wind abrasion eroded unprotected surfaces

💡 Explanation

Differential thermal expansion weakened the bonding between the marble or semi-precious stones and the sandstone substrate, because the materials have different coefficients of expansion; therefore, the pietra dura loosens and may fall out rather than staying intact like plain sandstone would have.

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