Fuels

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Across
  1. 4. This gas is required for a substance to burn
  2. 6. The name given to the individual components separated from crude oil
  3. 7. The term that describes the process of energy being released from food
  4. 9. This gas mask up 78% of the Earth's atmosphere
  5. 11. This gas contributes to greenhouse gases, and therefore global warming
  6. 12. The site of fractional distillation
Down
  1. 1. The process used to separate crude oil into individual components
  2. 2. This gas burns with a pop
  3. 3. A method used to extinguish a chip pan fire
  4. 5. A type of fossil fuel formed from dead plant material
  5. 8. The term used to describe how runny a liquid is
  6. 10. A type of renewable energy