Crossword

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Across
  1. 4. Dirtying of air, water, or soil
  2. 5. Melting of ice due to rising temperatures
  3. 8. Waste that breaks down naturally
  4. 9. Energy from the sun
  5. 11. The 3 “R”s: Reduce, \_\_\_\_\_, Recycle
  6. 12. A species no longer existing
  7. 13. An energy source made from wind
  8. 14. An animal that is in danger of disappearing forever
Down
  1. 1. Layer of gases protecting Earth from harmful rays
  2. 2. The variety of life on Earth
  3. 3. To use again instead of throwing away
  4. 5. The gradual warming of Earth’s atmosphere due to greenhouse gases
  5. 6. A gas that plants take in to make oxygen
  6. 7. The loss of trees in forests
  7. 10. Farming without synthetic chemicals