Across
- 4. Humans breathe out this gas, plants take in
- 6. Chemicals added to the soil, help plants grow
- 8. The layer of air surrounding Earth
- 10. Long periods of no rainfall or snow
- 11. Place in nature where a plant or animal lives
- 13. When a species dies off
Down
- 1. The lungs of Earth, absorbs carbon dioxide
- 2. Reefs Protect coastlines
- 3. The cutting or burning of many trees
- 5. Earth heating up
- 6. Coal, gas and oil
- 7. A greenhouse gas made by animals, like cows
- 9. Keep the Earth cool and absorb carbon dioxide
- 12. What humans and animals need to live
- 14. How hot or cold something is