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Pollution refers to the contamination of something that makes it harmful for human health and unsuitable to be used.water pollution means making water harmful and unsuitable to be used by throwing waste,filth, etc.into it water is polluted in many ways.Human beings are mostly responsible for it.
Farmers use chemical fertilizer and insectides in their fields. Rain and floods wash away some of the chemicals. They get mixed with the water of canals, ponds and rivers and pollute water. Mills and factories also pollute water by the waste materials.