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Word Count: 290
Pollution comes in various forms Whether its toxic waste CFCs or sewage they are all hazardous to the earth These can deplete the earth and its inhabitants of resources causing a harmful change A product of pollution is acid rain We shall see that acidification is harmful to all forms of life Acid rain is any form of precipitation that is polluted by sulphur dioxide SO2 and nitrogen oxides NOX This acid precipitation can be in the form of rain snow sleet fog or cloud vapors The acidity of substances dissolved in water are measured by their pH levels Normal precipitation pH levels fall between 50-562 When levels fall below these numbers then the precipitation is said to be acidic There are two ways in which acid deposition can form The first way occurs when nitrogen oxides and sulphur dioxide land on the Earths surface and interact with frost or dew The second way takes place due to the oxidation of nitrogen oxides or sulphur dioxide gases that are released into the air3 Since it may take up to several days for the gases to be altered into their acid counter-parts the pollutants can travel miles away from their original source Emissions of SO2 are responsible for the majority of the acid deposition which falls to Earth When we burn coal we are releasing SO2 into the air since coal is slight made up of sulphur Volcanic eruptions can add a great deal of sulphur into the atmosphere Everyday organic decay adds sulphur into the air as well SO2 can hit the Earths surface in dry forms or wet forms by undergoing the following reactions SO2 H20 H2SO3 SO2 O2 SO3 H2SO42
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