What makes crude oil heavy?

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  1. #highly
  2. #easily
  3. #because
  4. #gravity
  5. #extra
  6. #normal
  7. #crude
  8. #specific
  9. #higher
  10. #viscous
  11. #wells
  12. #density
  13. #cannot
  14. #light
  15. #under
  16. #conditions
  17. #referred
  18. #heavy
  19. #production
  20. #reservoir