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ATMOSPHERIC POLLUTION<br />
Statue, Kolmar, France<br />
SO2 (sulfuric dioxide) combines with atmospheric moisture (H20), yielding acid rain, or sulfuric acid (H2SO4).  Calcium carbonate in limestone statuary dilutes the sulfuric acid to form calcium sulfate, corroding the stone.

Fphoto-61990604B-6DS.jpg

ATMOSPHERIC POLLUTION
Statue, Kolmar, France
SO2 (sulfuric dioxide) combines with atmospheric moisture (H20), yielding acid rain, or sulfuric acid (H2SO4). Calcium carbonate in limestone statuary dilutes the sulfuric acid to form calcium sulfate, corroding the stone.

Copyright:© 2006 Diane Hirsch - Fundamental Photographs

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Diane Hirsch