Complete the sentences about pollution, focusing on its definition, causes, and types. Use the provided keywords.

Here are the completed sentences:

1. You hear about pollution all the time.
2. It could be the smog in your city or the waste covering your beach.
3. Learn what pollution is, how it's caused, and types of pollution.
4. When it comes to pollution, there isn't just one type. There are lots of them.
5. However, before we can break down what causes pollution and the effects of pollution, it's important to look at what pollution is.
6. In simple terms, pollution is the introduction of contaminants into some areas of the environment.
7. This could be the toxic gases released from the burning of fossil fuels, or it could be the ash created by a natural volcano eruption.
8. As you can see, pollution can have natural causes or be caused by humans.