1. Sound Waves
Travel through matter.

6. Longitudinal Wave
Transverse Wave

9. This is how “Sound Canceling” Headphones work.

10. Echolocation song
Guitar strings

11. Non-Newtonian Fluid (Ooblek) and speaker
Sound waves in running water
Sound waves designs at various frequencies (sand)

12. What is a wave?
Longitudinal and Transverse