Earth day crossword

2. relating to or determined by the sun
3. the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects
6. - highly reactive gas composed of three oxygen atoms
7. protect (something, especially an environmentally or culturally important place or thing) from harm or destruction.
8. -reuse (discarded objects or material) in such a way as to create a product of higher quality or value than the original.
12. able to be maintained at a certain rate or level.
15. trash, such as paper, cans, and bottles, that is left lying in an open or public place.
17. the circumstances, objects, or conditions by which one is surrounded.
18. envelope of gases surrounding the earth or another planet
19. the branch of biology that deals with the relations of organisms to one another and to their physical surroundings

1. biological community of interacting organisms and their physical environment
4. - relating to or derived from living matter.
5. will replenish
9. something that has been emitted—released or discharged
10. a place to dispose of refuse and other waste material by burying it and covering it over with soil, especially as a method of filling in or extending usable land.
11. - natural home or environment of an animal, plant, or other organism
13. closely and neatly packed together: dense
14. maintain (something) in its original or existing state.
16. convert (waste) into reusable material