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