What is a mechanical layer?

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Tags

1. #mechanical
2. #mantle
3. #rigidity
4. #layer
5. #boundaries
6. #sometimes
7. #earth
8. #differentiated
9. #about
10. #though
11. #information
12. #compositional
13. #their
14. #places
15. #strength
16. #layers
17. #these
18. #crust