What caused dinosaurs extinction?

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Tags

1. #thought
2. #scientists
3. #massive
4. #proposed
5. #extinction
6. #comet
7. #impact
8. #generally
9. #asteroid
10. #alvarez
11. #which
12. #million
13. #devastated
14. #years
15. #global
16. #walter
17. #caused
18. #through
19. #environment
20. #mainly
21. #originally