Crack the Code: Environmental Systems!

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