Question

_ _ _ _ _ is the contamination of water by substances harmful to life.
(A)- water pollution
(B)- air pollution
(C)- noise pollution
(D)- none of the above

Answer 1

Hint: Through the release of contaminants and pollutants into the environment, disrupting the ecological balance of life of the organisms present in the air, water and land is known as Pollution.

Complete answer:
Pollution is the introduction of the harmful substances r form of energy which have adverse effects on the environments and the species living in it. These substances are known as pollutants that damage the environment, being present in air, water, and land. Thereby entering our bodies through the food chain or the ecosystem because of the slower rate of the disposal.
Through the release of toxic gases, particulates, and chemicals into the atmosphere as they reach harmful concentration is known as Air pollution. It may happen from both natural and man-made occurrences like the emission from the factories, the automobiles, forest fire, volcanoes etc.
Similarly, the unwanted and excessive sound that disrupts the natural balance, the human activities and the environmental quality is known as the Noise pollution. The main source is the traffic in cities, the machineries, and domestic gadgets.
Whereas the contamination of the water bodies by the release of chemicals or micro-organisms, making it toxic and causing the degradation of the quality as well as the life of the marine animals.
It may occur due to human activities like the discharge of industrial waste, the sewage treatment, marine dumping, chemical fertilizers and pesticides and other natural occurrences like flood, animal waste etc.

Therefore, the contamination of water by substances harmful to life is known as option (A)- water pollution.

Note:
The pollutants present, either directly or indirectly harm human life via the food chain and its environment through the contamination of the air, water, and land.