Why is Lhasa known as the Roof of the World?

Related questions

1. What is the best month to visit Tibet?
2. Can you visit Tibet from China?
3. How many days do you need in Nepal?
4. Which valley is known as roof of the world?
5. Do Lhasa Apso dogs bark a lot?
6. How far is Tibet from Kathmandu?
7. Is the Dalai Lama vegan?
8. Do Tibetan Buddhist believe in God?
9. How much is a Lhasa Apso cost?
10. Where does the Dalai Lama currently live?

Tags

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5. #nickname
6. #capped
7. #spiritual
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15. #capital
16. #monks
17. #level
18. #plateau
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20. #lofty
21. #known
22. #tibetan
23. #sometimes
24. #mountains
25. #meters