Title: OCC_L10M7_ Review

Q: Select the correct answer.
- PM, Particulate Matter, refers to all the small pieces of solids and liquids in the air. (correct)
- PM, Particulate Matter, refers to post meridiem.
- PM, Particulate Matter, refers to particles of carbon dioxide.

Q: Select all the correct answers.
- PM can be formed naturally, such as pollen released from flowers or volcanoes erupting. (correct)
- PM comes from human sources such as car exhaust fumes. (correct)
- We can see PM and it is harmful to the environment and our health.

Q: Select the correct answer.
- PM is bad because it can cause lung cancer or other health issues. (correct)
- PM is bad because it causes natural disasters such as volcanic eruptions.
- PM is bad because the particles cause fire.