Unit 2 - Name: ___________________

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