#1 Choice Board

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Across
  1. 2. big body of dense ice
  2. 7. dark liquid that is a type of fossil fuel
  3. 9. gasses released into the air
  4. 13. produced through animal respiration
  5. 15. natural community of plants and animals
  6. 16. substance that causes allergies
Down
  1. 1. main component of natural gas
  2. 3. rock that is burned for energy
  3. 4. gasses surrounding earth
  4. 5. transmission of energy in waves
  5. 6. nonrenewable energy
  6. 8. gas made up of 3 oxygen atoms
  7. 10. atmospheric conditions/short term
  8. 11. atmospheric conditions/long term
  9. 12. substance that contaminates
  10. 14. period of unusually dry weather