This document discusses different types of sounds including pleasant and unpleasant sounds as well as noises. It explores how sounds can be loud or quiet, high or low pitched, and can travel through air, solids, and water. The document also examines machines that make noise and transmit sound.

1. Unit 8.
It’s a noisy world

3. Objects which make no sounds

4. Objects which make sounds

5. Sounds
can be…

6. Pleasant sounds .

7. Unpleasant sounds .
noises

8. loud quiet

9. high
low

10. Sounds that are bad for your
health

11. What can
sound
travel through?

12. Sounds can travel through air

13. Sounds can travel through
solids

14. Sounds can travel through water

15. Machines that make noise

16. Machines that transmit sound

17. The end