CRISTINA PEDRAZZINI / SCIENCE PHOTO LIBRARY CRISTINA PEDRAZZINI / SCIENCE PHOTO LIBRARY
Acid rain erosion. Statue (bas-relief) eroded by acid rain. Acid rain occurs when pollutants in the air, such as oxides of nitrogen and sulphur, dissolve in atmospheric water. The acids formed attack carbonate-bearing rocks such as limestone and sandstone. The acid may either fall as acid rain or form spontaneously on damp surfaces in a badly polluted area. Photographed in Venice, Italy.
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