Earth Day Crossword Puzzle

2. To keep something as it is.
5. System that's created by animals and plants interactions with each other.
8. A place where organisms live and create interactions.
9. Type of energy where it can be reused repeatedly without harming the environment.
12. Objects that have been thrown out in public places.
13. Layer of gas that surrounds Earth's atmosphere.
15. Old products get modified to become newer products.
17. Decayed organic matter that is used as a fertilizer.
18. Place where garbage is thrown out.
19. Made from a living thing, lack of chemicals.

1. Keep or maintain things
3. Substances that have been entered into the air.
4. When a species dies out completely in an area.
6. Something from the sun, can be a type of energy.
7. Type of energy where it can be used and replace by nature.
10. Reusing a material or object.
11. Place where an organism lives.
14. Type of science were you study how living organisms interact with one another and their environment.
16. Releasing greenhouse gases, not recycling, and creating problems for the planet.
19. Gas composed of only oxygen.