Acid Rain
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Acid rain is a term for precipitation, such as rain, snow, sleet, or hail, that has been polluted by acids and has a pH lower than 5.6. It is also known as acid deposition. This rain pollutes thousands of lakes, rivers, and streams worldwide and kills the fish and other wildlife. It also harms buildings and bridges. Rainforests and soil can also be harmed due to high concentrations of acid rain.
Acid rain is formed when water vapor in the air reacts with certain chemical compounds. Two primary sources of acid rain are sulfur dioxide and nitrogen oxides. They combine with moisture in the atmosphere to form nitric acid and sulfuric acid. These acids can be carried away far from its origin by wind...