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ACID RAIN (SO2) DAMAGE: LIMESTONE GARGOYLES<br />
Notre Dame, Paris, 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.

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ACID RAIN (SO2) DAMAGE: LIMESTONE GARGOYLES
Notre Dame, Paris, 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:© 1989 Richard Megna - Fundamental Photographs

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Richard Megna