Energy

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Across
  1. 2. fuels - energy that is created by remains of animals.
  2. 4. - it's another way of saying this energy will run out one day.
  3. 7. - Original.
  4. 8. dioxide - the gas that we breathe out.
Down
  1. 1. - wood, garbage, crops, alcoholic fuels and landfill gas are all types of ...
  2. 3. to produce.
  3. 5. - this energy will run out one day.
  4. 6. - a way to measure hot and cold.