Earth Day

4. what we breathe
5. free from dirt, marks, stains, etc.
7. our planet
8. to save or protect something
10. cylindrical metal containers
11. to protect
13. a.k.a. power
15. a synthetic material that can be molded when soft and formed into a solid shape
17. to limit something
18. a woody perennial plant, typically having a single stem or trunk growing to a considerable height and bearing lateral branches
19. a hard, brittle substance, typically transparent or clear

1. the color of grass
2. “colorful plants”
3. a thin sheet material produced by mechanically or chemically
6. a very large expanse of sea
9. to use again
12. this month
14. to convert waste materials into new materials and objects
15. living things that grow in the earth and have a stem, leaves, and roots
16. to contaminate or harm (water, air, or a place) with harmful or poisonous substances