Are the Smoky Mountains older than the Rocky Mountains?

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Tags

1. #million
2. #millions
3. #bigger
4. #actually
5. #erosion
6. #whittled
7. #rockies
8. #formed
9. #where
10. #large
11. #stand
12. #appalachians
13. #years
14. #quadruple
15. #presumed
16. #least
17. #appalachian
18. #mountains