Across
- 1. A chemical in all living things
- 4. Dirt where plants grow
- 8. Protecting nature
- 10. Catching too many fish
- 12. Using resources without running out
- 13. How water moves in nature
- 14. Dirty stuff that harms air, land, or water
- 15. Usual weather in a place
- 16. A resource that can't be replaced quickly
- 20. How plants make food using sunlight
Down
- 2. A variety of life in one place
- 3. Gases that trap heat in Earth’s air
- 5. When wind or water wears land away
- 6. Cutting down lots of trees
- 7. A group of the same species living together
- 9. A resource that comes back again and again
- 11. Where an animal lives
- 17. A group of living and nonliving things working together
- 18. Rotten food and plants that help soil
- 19. Reusing trash to make new things