Coal and Petroleum

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Across
  1. 4. Hardest coal with more than 86% of carbon content.
  2. 5. tar Plastic, drugs, naphthalene balls all are prepared from this.
  3. 6. First stage of coal, looks like manure.
  4. 10. Ammonium hydroxide solution.
  5. 12. Coal tar and coke are distilled from this type of coal.
  6. 15. Pure form of carbon with 90% carbon.
  7. 16. They can be substituted or replaced.
  8. 17. They are limited, cannot be substituted or replaced.
  9. 19. Material that exist freely in nature.
Down
  1. 1. Process of conversion of dead vegetation into coal.
  2. 2. Black gold made up of hydrocarbons.
  3. 3. Process of heating a complex substance in limited supply of air to get byproducts.
  4. 7. The time period in which plenty of coal has formed.
  5. 8. Contains 60% of carbon, used in thermal power station.
  6. 9. Various components obtained after fractional distillation of petroleum.
  7. 11. gas Mixture of hydrogen, methane and carbon monoxide.
  8. 13. Coal, petroleum and natural gas are called as _____.
  9. 14. Process of separating crude oil into usable components.
  10. 18. Compounds made of only carbon and hydrogen.