Why is crude oil so valuable?

Related questions

1. What type of oil is WTI?
2. What is the meaning of Brent?
3. What is the symbol for WTI crude oil?
4. What does Brent mean?
5. What does the name Brittany mean?
6. What is the ticker for Brent crude oil?
7. Where is the Brent oil field?
8. What is the difference between crude oil and Brent?
9. How is Brent crude oil price determined?
10. What is the name of Nigerian crude oil?

Tags

1. #purposes
2. #energy
3. #transport
4. #sources
5. #thing
6. #other
7. #million
8. #among
9. #world
10. #barrels
11. #condensate
12. #important
13. #crude
14. #currently
15. #around