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Which of the following is a cause of pollution of water resources?
1. Dead aquatic plants
2. Deforestation
3. Dead aquatic animals
4. Radioactive substances

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Correct Answer - Option 4 : Radioactive substances

The correct answer is Radioactive substances.

  • Radioactive waste is a source of water pollution.
  • Radioactive substances are used in nuclear power plants, industrial, medical, and other scientific processes.
  • They can be found in watches, luminous clocks, television sets, and x-ray machinery.
  • There are also naturally occurring radioisotopes from organisms and within the environment. If not properly disposed of, radioactive waste can result in serious water pollution incidents.

  • There are two sources of radioactive contamination in drinking water.
    • The first is naturally occurring radionuclides that are contained in the soil that water moves through. Some areas are susceptible to contamination from phosphate-rich soils and rock.
    • The second source of radioactive contamination comes from man-made sources.
  • Radionuclides found in drinking water are members of three radioactive series, uranium, thorium, and actinium, and include the naturally occurring elements radium, uranium, and the radioactive gas radon. 

  • Deforestation: 
    • ​Deforestation is the permanent removal of trees or a decrease in the forest area to make room for something besides the forest.
    • Forests cover more than 30% of the Earth's land surface, according to the World Wildlife Fund.

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