Do sound waves go up or down?

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Tags

1. #medium
2. #longitudinal
3. #compress
4. #never
5. #backward
6. #slinky
7. #compressed
8. #forward
9. #forth
10. #there
11. #travel
12. #vacuum
13. #illustrated
14. #expanding
15. #through
16. #being
17. #sound
18. #compression
19. #better
20. #since
21. #object
22. #travels
23. #solid