Earth Day

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Across
  1. 4. what we breathe
  2. 5. free from dirt, marks, stains, etc.
  3. 7. our planet
  4. 8. to save or protect something
  5. 10. cylindrical metal containers
  6. 11. to protect
  7. 13. a.k.a. power
  8. 15. a synthetic material that can be molded when soft and formed into a solid shape
  9. 17. to limit something
  10. 18. a woody perennial plant, typically having a single stem or trunk growing to a considerable height and bearing lateral branches
  11. 19. a hard, brittle substance, typically transparent or clear
Down
  1. 1. the color of grass
  2. 2. “colorful plants”
  3. 3. a thin sheet material produced by mechanically or chemically
  4. 6. a very large expanse of sea
  5. 9. to use again
  6. 12. this month
  7. 14. to convert waste materials into new materials and objects
  8. 15. living things that grow in the earth and have a stem, leaves, and roots
  9. 16. to contaminate or harm (water, air, or a place) with harmful or poisonous substances