How deep is the sand in a desert?

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Tags

1. #desert
2. #ranging
3. #egypt
4. #world
5. #around
6. #sheet
7. #shallower
8. #simpson
9. #centimeters
10. #prehistoric
11. #sahara
12. #widely
13. #selima
14. #depth
15. #times
16. #southern
17. #varies
18. #approximately