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The cause of the acid rain phenomenon is the increase in the energy of oxide nitrogen and sulfur in the atmosphere due to human activities triggers. Cars, thermal power plants and some other plant when burned fuel has sulfur dioxide discharged into the atmosphere.Metallurgical plants, refineries also discharge sulfur dioxide. In addition, discharge gas SO2 gas with NO atmosphere created at high temperatures of combustion reaction of fuel. The fuels such as coal, oil and gas that we use contain S and n. When burning in atmospheric environment composed of O2, they will turn into SO2 and NO2, is easy to dissolve in water. During rain, under the effect of the radiation environment, the oxid will react with water vapor in the atmosphere to form acid such as H2SO4, Sunfur acid, Nitric acid. They fall to the ground along with the raindrops or stay in the atmosphere and clouds in the sky. This acid itself has made rainwater acidic.
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