How are oasis useful in desert?

Related questions

1. What is an oasis nurse?
2. What grows in an oasis?
3. What does Oasis mean in healthcare?
4. How big is an oasis?
5. What causes Oasis?
6. What is Oasis data collection?
7. Where is a famous oasis?
8. What does Oasis mean in the Bible?
9. What is an oasis answer?
10. What is Oasis training?

Tags

1. #replenished
2. #trade
3. #route
4. #location
5. #oasis
6. #political
7. #desert
8. #importance
9. #travel
10. #cases
11. #areas
12. #military
13. #water
14. #meant
15. #critical
16. #transportation
17. #particular
18. #supplies
19. #routes
20. #caravans
21. #control
22. #oases