Coal and Petroleum

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Across
  1. 2. process of conversation of dead vegetation into coal
  2. 3. the various components obtained during refining of petroleum
  3. 5. contains 40% carbon
  4. 6. chemicals derived from petroleum and natural gas
  5. 8. contains 90% carbon
  6. 9. hydrocarbon made up of carbon and hydrogen and has chemical formula of ch4
Down
  1. 1. Known as brown Coal
  2. 2. period when earth was covered with dense and swampy forests
  3. 4. also known as crude oil
  4. 7. resources which are constantly available regardless of use