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Acid Rain Acid rain is a term which is used to describe a variety of processes which might more accurately be referred to as acidic deposition Natural rainfall is slightly acidic due to dissolved carbon dioxide picked up in the atmosphere Organisms and ecosystems all over the planet have adapted to the slightly acidic nature of normal rain and thus it poses no environmental problems It is an increase in the acidity of rain caused by human activities such as the combustion of fossil fuels that has turned acid rain into a problem Highly acidic rain can damage or destroy aquatic life forests crops and buildings as well as posing a threat to human health The actual term acid rain was first used over one hundred years ago by British chemist Robert Angus Smith At that time he realized that smoke and fumes from human activities could change the acidity of precipitation Unfortunately his awareness was not considered an environmental concern until the 1950s Around this time increased levels of acidity were discovered in lakes in both Canada and Scandinavia At first this was looked at as an interesting situation rather than a growing problem Since that time much research has gone into identifying the sources of acid rain and the damage that it causes As research continued the situation reached catastrophe proportions in the late 1970s By this time thousands of lakes in Canada and Scandinavia had been declared dead devoid of life while emissions of acid gasses continued to rise Acid Rain Chemistry As mentioned earlier the term acid rain is used to describe a variety of different types of acidic deposition These include wet deposition such as rain snow and fog as well as dry deposition in the form of acidic gases and dust The term acid rain is only used to describe deposition which is more acidic than normal Acidity is measured on the pH scale
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