Why are salt flats flat?

Related questions

1. What months are summer in Bolivia?
2. Does Bolivia get snow?
3. Does it rain a lot in Bolivia?
4. What are the coldest months in Bolivia?
5. What do they drink in Bolivia?
6. How do I get to Salar de Uyuni?
7. What is the best time to visit Bolivia?
8. What is a typical breakfast in Bolivia?
9. How big are the Bolivian Salt Flats?
10. What is the weather like in Bolivia in July?

Tags

1. #water
2. #hollows
3. #replenished
4. #lakes
5. #evaporates
6. #closed
7. #desert
8. #behind
9. #where
10. #faster
11. #dissolved
12. #dried
13. #flats
14. #layer
15. #would
16. #solid
17. #drain
18. #rainfall
19. #vapour
20. #heated
21. #minerals
22. #climate