1. Acid Rain
... from above. The corrosive effects of acid rain are particularly obvious on limestone, because it is composed of calcium carbonate, which is highly reactive with acid rain. Tombstones made of marble (which is metamorphosed or heated limestone) have been badly damaged, while older tombstones made of slate remain intact. Famous buildings such as the Taj Mahal, The United States Capitol building ... ...
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- Approx Pages: 15