topic 6-8

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Across
  1. 2. it is a gas and a liquid
  2. 4. radiant energy that emitted to the sun
  3. 7. is when you get energy from the earth
  4. 9. a natural resource that cannot be produced.
  5. 11. The generation of electricity and useful heat jointly
  6. 13. are gases in the atmosphere that absorb radiation
  7. 14. wind go through a turbine and uses it to create energy
  8. 16. a natural resource that can be produced again.
  9. 17. there are materials that heat can pass through them
Down
  1. 1. energy that is transmitted in the form of radiation
  2. 3. a substance used for refrigeration
  3. 5. harm to lake and rivers resulting waste heat
  4. 6. the transfer of heat through direct contact
  5. 8. Energy development is the effort to provide sufficient
  6. 10. A natural fuel such as coal or gas
  7. 12. transfer of heat through fluids
  8. 15. the transfer of heat through without movement of particles.