Question

Define pollution. How is it caused​

Answer 1

Here is your answer user.

The presence of unwanted and harmful substances in the environment is called pollution .

Pollutants are substances that cause.

Pollution pollution causes harm to our environment

Answer 2

Answer:

Pollution is the introduction of harmful materials into the environment. ... These harmful materials are called pollutants. Pollutants can be natural, such as volcanic ash. They can also be created by human activity, such as trash or runoff produced by factories. Pollutants damage the quality of air, water, and land.

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