What are the 4 types of seismic waves?

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Tags

1. #earth
2. #types
3. #planet
4. #seismic
5. #along
6. #inner
7. #radiate
8. #waves
9. #layers
10. #energy
11. #travel
12. #water
13. #through
14. #surface
15. #earthquakes
16. #ripples