Environmental
A Mississippi homeowner notices white crystalline stains on basement walls and floors after heavy rains. This is most likely caused by:
AMold from organic material
BEfflorescence — mineral salts left behind when water seeps through masonry and evaporates, indicating water infiltration✓ Correct
CLead paint deterioration
DAsbestos fiber migration
Explanation
Efflorescence is white crystalline deposits formed when water carrying dissolved minerals (salts) seeps through masonry and evaporates on the surface, leaving the minerals behind. While generally not a structural problem itself, efflorescence indicates water infiltration that can lead to more serious issues if not addressed.
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