What are P and S waves also called?

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Tags

1. #compressional
2. #shear
3. #their
4. #stands
5. #through
6. #friday
7. #first
8. #always
9. #waves
10. #called
11. #earth
12. #slowly
13. #secondary
14. #because
15. #hence
16. #propagate
17. #second
18. #primary
19. #arrive