energy

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Across
  1. 2. added to gasoline to make engines run smoothly
  2. 4. the process by which petroleum is made into different products
  3. 5. the type of coal that is most abundant in the US
  4. 7. a compound that contains only hydrogen and carbon
  5. 9. the first type of true coal
  6. 12. the hardest type of coal
  7. 13. a solid fossil fuel
  8. 14. a brown, brittle plant material with a low % of carbon
  9. 15. a substance from which energy can be obtained
Down
  1. 1. used for barbecues
  2. 3. both coal and __________ are forms of carbon
  3. 6. fossil fuels are_________________
  4. 8. another name for crude oil
  5. 10. this gas is often trapped with petroleum
  6. 11. used to heat our homes