How is oil created?

Related questions

1. Are dinosaurs still alive today?
2. How many years of oil are left in the world?
3. Will oil run out?
4. Can we make petrol?
5. Why is there oil in the earth?
6. Can oil be made?
7. Will oil be replaced?
8. Can we run out of oil?
9. How do humans use oil in everyday life?
10. Why is oil so useful?

Tags

1. #fossil
2. #plants
3. #under
4. #multiple
5. #organisms
6. #formation
7. #these
8. #zooplankton
9. #trapped
10. #large
11. #amount
12. #millions
13. #formed
14. #bottom
15. #algae
16. #years
17. #beginning
18. #animals
19. #happened
20. #crude
21. #layers