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ACID RAIN DAMAGE TO STATUE OF WASHINGTON
Before - Washington as Commander-in-Chief
Washington Sq Arch, Washington Sq Park, July 17, 1935. SO2 combines with atmospheric moisture (H20), yielding acid rain, or sulfuric acid (H2SO4). CaCO3 in limestone statuary dilutes the sulfuric acid to form calcium sulfate, corroding the stone.
Copyright:© 1994 NYC Parks Photo Archive - Fundamental Photographs
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