What are sand dunes formed by erosion or deposition?

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Tags

1. #forces
2. #chemical
3. #earth
4. #erosional
5. #depositional
6. #results
7. #physical
8. #formation
9. #accumulation
10. #leads
11. #formed
12. #processes
13. #dunes
14. #rocks
15. #water
16. #erosion
17. #eroded