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Across
  1. 3. resources that that millions of years to replace
  2. 9. substances released when fossil fuels are burned
  3. 10. solid fossil fuel that comes from dead plants
  4. 15. resources that can be replaced over a short period of time
  5. 17. a gaseous fossil fuel from dead animals
  6. 18. a way to extract natural gas from the Earth
  7. 19. energy from falling water
  8. 20. another word for crude oil or liquid fossil fuels
Down
  1. 1. to put the land back the way it was before mining
  2. 2. energy from the heat inside the Earth
  3. 4. stored energy
  4. 5. a layer of material laid down naturally
  5. 6. energy from the sun
  6. 7. a gas released by decaying organisms
  7. 8. energy of motion
  8. 11. energy from uranium
  9. 12. to pollute
  10. 13. nonrenewable resouces from ancient plants and animals
  11. 14. to move
  12. 16. energy from the wind blowing