PROTECTING OUR ENVIRONMENT

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Across
  1. 3. ______________ dioxide is a gas often created by combustion. It contributes to global warming
  2. 5. Manmade structure. Blocks a river. Used to harness hydroelectric power
  3. 6. The mass of air surrounding the Earth
  4. 9. A ___________ resource is one that can be used more than once
  5. 13. The result of many years of giving off Carbon Dioxide and other chemicals
  6. 15. Fifth-largest planet
  7. 16. What we use to power our homes
  8. 17. The release of harmful substances into the air or water is called
  9. 18. To make less waste
  10. 19. H2O
Down
  1. 1. A type of energy from the sun
  2. 2. Natural environment
  3. 3. The careful utilization of a natural resource in order to prevent depletion
  4. 4. To use something again
  5. 7. Converting waste materials into reusable objects
  6. 8. The average weather patterns of a region
  7. 10. Grown or produced naturally, without chemicals
  8. 11. Revolving blade, used to harness wind power
  9. 12. Material, food, etc. that is no longer needed and thrown away
  10. 14. The _____________ layer of the atmosphere protects us from the sun's most harmful rays