How is oil made by nature?

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Tags

  1. #determined
  2. #amount
  3. #stage
  4. #became
  5. #sediment
  6. #pressure
  7. #natural
  8. #other
  9. #millions
  10. #formed
  11. #biomass
  12. #plants
  13. #bacteria
  14. #after
  15. #layer
  16. #deeper
  17. #material
  18. #years
  19. #degree
  20. #along
  21. #began
  22. #buried