Fossil Fuels

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Across
  1. 3. when burned, all fossil fuels cause -
  2. 8. coal is a (solid, liquid, or gas)
  3. 10. It can take millions of years to replace fossil fuels, they are -
  4. 12. if a resource is renewed by natural processes in a short amount of time, it is -
  5. 13. energy of motion is called -
  6. 15. the cleanest burning fossil fuel -
Down
  1. 1. another word for crude oil
  2. 2. to pollute
  3. 4. coal, oil, and natural gas are all -
  4. 5. fossil fuels are made from dead _____ and animals
  5. 6. fossil fuels are (inexpensive, expensive)
  6. 7. one method of extracting natural gas is -
  7. 9. stored energy is called _____ energy
  8. 11. oil is a (solid, liquid, or gas)
  9. 14. natural gas is a (solid, liquid, or gas)