Earth day Crossword

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Across
  1. 3. the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects
  2. 7. envelope of gases surrounding the earth or another planet
  3. 9. - reuse (discarded objects or material) in such a way as to create a product of higher quality or value than the original.
  4. 10. a place to dispose of refuse and other waste material
  5. 13. - relating to or derived from living matter.
  6. 16. something that has been emitted—released or discharged
  7. 17. protect (something, especially an environmentally or culturally important place or thing) from harm or destruction.
  8. 19. able to be maintained at a certain rate or level.
Down
  1. 1. the branch of biology that deals with the relations of organisms to one another and to their physical surroundings
  2. 2. will replenish
  3. 4. - highly reactive gas composed of three oxygen atoms
  4. 5. -convert (waste) into reusable material
  5. 6. biological community of interacting organisms and their physical environment
  6. 8. - natural home or environment of an animal, plant, or other organism
  7. 11. maintain (something) in its original or existing state.
  8. 12. trash, such as paper, cans, and bottles, that is left lying in an open or public place.
  9. 14. closely and neatly packed together: dense
  10. 15. relating to or determined by the sun
  11. 18. the circumstances, objects, or conditions by which one is surrounded.