Fossil fuels

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Across
  1. 3. A greenhouse gas released from burning fossil fuels.
  2. 5. A device used to extract oil and gas from the ground.
  3. 7. A type of renewable energy source that uses the wind.
  4. 8. A term used to describe the energy crisis.
  5. 9. A person who studies fossils?
  6. 12. A measure of how much energy is used.
  7. 15. A renewable energy source.
  8. 17. A renewable energy source that uses the energy of moving water.
  9. 18. A gas often found with natural gas.
  10. 20. A major environmental consequence of burning fossil fuels.
  11. 21. A type of renewable energy source that uses the Earth's heat.
Down
  1. 1. A process of extracting oil or gas from rock by injecting a mixture of water, sand, and chemicals.
  2. 2. This are made from decomposing plants and animals.
  3. 4. A type of renewable energy source that uses organic matter to produce energy.
  4. 6. A natural resource that cannot be replenished at the same rate it is consumed.
  5. 10. A type of renewable energy source that uses sunlight.
  6. 11. A type of pollution caused by burning fossil fuels.
  7. 13. A process that converts organic matter into fossil fuels over millions of years.
  8. 14. A fossil fuel formed from the remains of ancient plants.
  9. 16. A fossil fuel formed from the remains of ancient marine organisms.
  10. 19. A fossil fuel often used for cooking and heating.
  11. 20. A fossil fuel often used in power plants to generate electricity.