Efflorescence on masonry is caused by which process?

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Multiple Choice

Efflorescence on masonry is caused by which process?

Explanation:
Efflorescence appears when soluble salts in the masonry dissolve in absorbed moisture and are brought to the surface by capillary action. The visible white deposit forms when that surface moisture evaporates, leaving the dissolved salts behind to crystallize. So the evaporation of the moisture at the surface is the step that triggers the salts to precipitate and create the efflorescence. The salts had to move there with the water, but without evaporation, the salts wouldn’t crystallize visibly. Freeze-thaw cycles and carbonation are not responsible for producing the white deposit.

Efflorescence appears when soluble salts in the masonry dissolve in absorbed moisture and are brought to the surface by capillary action. The visible white deposit forms when that surface moisture evaporates, leaving the dissolved salts behind to crystallize. So the evaporation of the moisture at the surface is the step that triggers the salts to precipitate and create the efflorescence. The salts had to move there with the water, but without evaporation, the salts wouldn’t crystallize visibly. Freeze-thaw cycles and carbonation are not responsible for producing the white deposit.

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