Energy

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Across
  1. 2. a massive oil spill in 2010
  2. 4. Formed from the remains of organisms millions of years ago
  3. 7. natural underground pressure pushes oil to the surface
  4. 10. Joining 2 atomic nuclei
  5. 13. natural gas is the ____ burning of the fossil fuels
  6. 14. Nuclear fission involves ____ __ an atoms nucleus
Down
  1. 1. Water/gas is injected underground to push oil upwards
  2. 3. ____ separates the different hydrocarbons called crude oil.
  3. 5. used when coal deposits are near the surface
  4. 6. Some atoms are ___
  5. 8. _____ are created during subsurface mining
  6. 9. With secondary extraction, the initial pressure ____
  7. 11. The major contributor of global warming is ___
  8. 12. Also known as hydraulic fracturing
  9. 13. formed from dead plant material called peat