What is the oldest land on earth?

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Tags

1. #billion
2. #above
3. #crystals
4. #years
5. #hills
6. #million
7. #zircon
8. #after
9. #previously
10. #thought
11. #earth
12. #australia
13. #dates
14. #continents
15. #reveal
16. #solar
17. #system
18. #formed
19. #arose
20. #earlier
21. #oldest
22. #crust