What are the 2 main branches?

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Tags

1. #physical
2. #groups
3. #divided
4. #branches
5. #itself
6. #science
7. #three
8. #biological
9. #commonly
10. #sciences
11. #which
12. #study
13. #includes
14. #chemistry
15. #astronomy
16. #geology
17. #concerns
18. #meteorology
19. #physics
20. #earth