Energy we use

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Across
  1. 3. a liquid fossil fuel that can be burned to transfer energy
  2. 5. energy source made from unstable elements
  3. 6. a wheel with blades that rotate by the pressure of moving water, steam, or air
  4. 9. process of burning a fuel to produce heat or light
  5. 10. a solid fossil fuel that is burned to transfer energy
  6. 12. first or most important
  7. 14. changes the energy of motion into electrical energy
Down
  1. 1. substance produced by pressure and decaying organisms
  2. 2. made for a particular purpose
  3. 4. an unstable element used by humans as an energy source
  4. 7. stores chemical energy that can change into electrical energy
  5. 8. releases energy as heat when it burns
  6. 11. a fossil fuel gas that is burned for energy
  7. 13. the result of an event