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Environment

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Across
  1. 1. sweet liquid inside a flower
  2. 4. mixture of decaying organic matter
  3. 6. area designated to receive household garbage
  4. 8. offspring of male donkey and female horse
  5. 9. destruction of forests
  6. 10. system comprising ecosystems and organisms
  7. 12. the worlds cleanest country
  8. 15. most abundant element found in air
  9. 16. opening in the earths crust from which lava flow
  10. 19. bird which lays the largest egg
  11. 21. the worlds largest biome
Down
  1. 2. underground layer of water-bearing permeable rock
  2. 3. the driest biome
  3. 4. substance that makes plant green
  4. 5. the wave energy released by earthquakes
  5. 7. substance that repels or kills plant or animal pests
  6. 11. any substance that evaporates quickly
  7. 13. extended period of no water
  8. 14. mixture of smoke and fog
  9. 17. chemical substance contained in all plants and animals
  10. 18. fastest cat in the world
  11. 20. largest plant family