Unit 2- Human Uses of Energy

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Across
  1. 4. Energy of moving water.
  2. 7. A liquid fossil fuel formed by the decay of ancient plants and animals.
  3. 8. The _______, or original source of energy of almost all fuels in the sun.
  4. 9. People use a lot of energy to heat and light buildings and to power tools, cards, and other electronic devices. A ______ is something made for a particular purpose.
  5. 12. Harmful substance released during energy production that poisons the land, water, and air.
  6. 14. Materials that are formed as ancient plants and animals decayed underground.
  7. 15. Energy that is obtained from beneath Earth's surface.
  8. 17. The process of burning a fuel to produce heat and light.
  9. 19. A nonrenewable energy source that formed from plant remains after they have formed a layer of peat.
Down
  1. 1. Comes from changes inside particles of matter.
  2. 2. A device used in power plamts to reduce or prevent the amount of pollutants that get into the air.
  3. 3. A device that spins as the gas flows and changes the heat energy of steam into energy of motion.
  4. 5. A pollutant that increases the atmosphere's ability to hol heat.
  5. 6. A device that changes the energy of motion into electrical energy.
  6. 10. The release of substances into the environment.
  7. 11. A _____ stores chemical energy and can convert that energy into electrical energy.
  8. 13. A fossil fuel that occurs in the gas state. Like petroleum, it is formed by the decay of ancient plants and animals.
  9. 16. A material that releases energy as heat when it burns.
  10. 18. Effects