Energy

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Across
  1. 2. something we should all try to save
  2. 5. our main source of energy
  3. 6. a fossil fuel made from plants and trees
  4. 9. the posh word for rain, snow, hail and sleet
  5. 14. the number of people who live in a town, country etc
  6. 15. something that can be burnt to give energy
  7. 17. the number of years it took for fossil fuels to form
Down
  1. 1. when a gas turns back into a liquid
  2. 2. when a liquid turns into a gas
  3. 3. a fossil fuel made from sea creatures
  4. 4. a fossil fuel made from sea creatures
  5. 7. a gas which forms a protective layer around the earth
  6. 8. the weather you would expect in a particular place
  7. 10. everything in our surroundings
  8. 11. a thick layer of gases which surrounds the earth
  9. 12. buildings where goods are made by machines
  10. 13. harmful waste or dirt in the air and water
  11. 16. to do with the sun