Topic 2 Human uses for Energy

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Across
  1. 4. energy created by pressure and heat underneath Earth's crust
  2. 5. first or most important
  3. 6. fuel an energy source made from unstable elements, such as uranium
  4. 9. an unstable element used by humans as an energy source
  5. 10. the burning of a fuel to produce heat and light
  6. 11. a fossil fuel gas that is burned for energy
  7. 13. a device that contains a wheel with blades that rotate by pressure of moving water, steam, and air
  8. 14. a substance produced by pressure and decaying organisms that is used for energy
  9. 17. can be used
  10. 19. energy from the movement of water
  11. 20. a harmful substance released into the environment
  12. 22. the release of something into the environment
Down
  1. 1. a device that stores chemical energy that can change into electrical energy
  2. 2. an effect
  3. 3. a gas that makes the atmosphere able to hold more heat, such as carbon dioxide and water vapor
  4. 7. a substance that releases energy when it burns
  5. 8. a device in a power plant that reduces the amount of released pollutants sent into the air
  6. 12. a device that changes the energy of motion into electrical energy
  7. 15. the result of an event
  8. 16. a liquid fossil fuel that can be burned to transfer energy
  9. 18. an object made for a specific purpose
  10. 21. a solid fossil fuel that is burned to transfer energy