Nonrenewable energy

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Across
  1. 4. A mix of hydrocarbons like oil and sulfur in a liquid state
  2. 5. A nuclear reaction where a neutron hits a large nucleus and breaks it apart
  3. 6. Black coal containing bitumen and about 80% carbon
  4. 8. A brown coal that is soft and made of 60-70% carbon
  5. 9. Energy formed from the reactions in nuclear fuel
  6. 12. a clean fossil fuel that is mainly methane
  7. 13. A precursor to coal that is made from partially decomposed plant matter
  8. 14. A cylindrical device that contains nuclear fuel in a reactor
  9. 15. Coal with the highest energy per volume and the greatest concentration of carbon at 90%
  10. 16. an oil gas extraction method that uses high-pressure fluid to break rocks and leaves lots of chemicals behind
  11. 18. The emission of ionizing radiation
  12. 19. The time it takes for half the mass of a compound to be left
Down
  1. 1. A measurement for rate of decay
  2. 2. fuels from biomaterial that fossilized millions of years ago
  3. 3. An energy source with a finite supply like fossil fuels and nuclear fuels
  4. 5. Carbon that hasn't been in the atmosphere for millions of years
  5. 7. The element most commonly used as nuclear fuel
  6. 10. Nuclear fuel that can no longer generate power but is still radioactive
  7. 11. A graph that represents oil use and predicts that when oil use will peak
  8. 17. A solid fuel formed from plant matter millions of years ago