Acid rain” is a mixture of wet and dry deposition i.e. deposited material from the atmosphere containing higher than normal amounts of nitric and sulfuric acids.
Acid Rain:
Acid rains are usually acidic which possesses elevated levels of hydrogen ions (low pH). Acid rain is mainly caused by emissions of harmful gaseous such as SO2SO2 (sulphur dioxide) and different oxides of nitrogen which react with the water molecules in the atmosphere to produce acids.
Acid rains mainly refer to the deposition of wet (rain, snow, sleet, fog, cloudwater, and dew) and dry (acidifying particles and gases) acidic components.
As we know that liquids with a less than 7 are acidic, and those with a pH greater than 7 are alkaline. “Clean” or unpolluted rain has an acidic pH, but usually no lower than 5.7, because carbon dioxide and water in the air react together to form carbonic acid, a weak acid.
Genetically Modified Organism
When an organism has been genetically modified using genetic engineering. They are used for foods (genetically modifying tomatoes to grow bigger, for example) and medicines. The first genetically modified mouse was in 1973, and the first plant was genetically modified in 1983.


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