Answer :

Air pollution- Certain human activities pollute the air by concentrations of harmful substances which is known as air pollution. For Example, carbon monoxide emitted by automobiles.

Water pollution: Releasing of contaminants in water by human activities is known as water pollution. For example dumping of waste in lakes, rivers and oceans from industries.

Land pollution: Dumping of toxic chemicals on land and making it infertile for cultivation is land pollution

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