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