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Pollution of Water- Online Notes for 8th Class Science

Pollution of Water- Online Notes for 8th Class Science 

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Water Pollution

We are surrounded by water in the form of rivers, lakes, ponds, oceans and even in the air present in the form of water vapours. It is one of the most abundant and main compounds on the Earth. 75% of the Earth’s surface is covered with water. The main sources of water supply are: –
  • Surface water from springs, waterfalls, rivers lakes, etc
  • Groundwater which is taken out from wells
  • Salty water
All living beings need water to carry out life processes. Therefore, it is called a supporter of the life but somehow due to human negligence, we are polluting water. The main causes of the water pollution are:-
  • Untreated industrial and domestic sewage in water bodies directly.
  • Draining of Inorganic pesticides and chemical fertilizers directly into the water by farmers. Some pesticides like DDT enter into aquatic animal bodies and eventually reach to human beings.
  • Animals bathing, washing clothes near water sources.
  • Leakage of oil from boats, ships etc pollute river and oceans.
Effects of Water Pollution
  1. Aquatic plants and animals reduced or killed by pollutants in their habitat.
  2. Untreated domestic sewage becomes a  place to the birth of organisms that cause water-borne diseases.

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