Acid rain has existed since the first factories of the Industrial Revolution began spitting out toxic emissions. An English scientist, Robert Angus Smith, coined the term "acid rain" in 1872 when he wrote of its corroding touch on buildings and deadly effect on plants.
Acid rain is rain that is more acidic than it should be. Acid rain is a complicated problem affecting soil and water chemis- try, as well as the life cycles of plants and animals on land and in the water. In addition, weather conditions contribute to air pollution and cause acid rain to spread vast distances.
The vinegar/distilled water mixture represents acid rain, with a pH of about 4. The leaves and stems put into the vinegar/distilled water mixture represent plants that soak up acid rainwater from the ground. As you can see from the chart, the roots have not grown as much in the water that is like acid rainwater.
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Acid rain was mainly caused by emissions of sulphur dioxide to the atmosphere from coal-fired power stations, and by emissions of oxides of nitrogen from various sources.
Diagram: Exhaust from vehicle as one of the major source of gases implicated in acid rain Acid deposition primarily results from the transformation of sulphur dioxide ( SO 2 ) and Nitrogen oxides ( NO x ) into dry or moist secondary pollutants such as sulphuric acid (H 2 SO 4 ), ammonium nitrate (NH 4 NO 3 ) and nitric acid (HNO 3 ).