What are the 3 types of fuel?

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Tags

1. #three
2. #formed
3. #heated
4. #turned
5. #provision
6. #layers
7. #solid
8. #years
9. #fuels
10. #deposits
11. #millions
12. #decay
13. #energy
14. #natural
15. #types
16. #there
17. #compacted
18. #fossil
19. #vegetation
20. #which