Answer:
Acid rain is caused due to mixing of poisonous gases with rain. When our industrial units emit poisonous gases like sulphur dioxide and nitrogen dioxide, these gases react with moisture present in air and form sulphuric acid and nitric acid respectively. These acids fall on the earth with rain making rain water acidic and harmful. Acid rain causes the corrosion of buildings and make food grains, fruits and vegetables on which it fall, unfit for consumption.
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