Advanced Earth Day-themed Crossword Puzzle
Listed Items
- 1.  In peril of being lost forever
 
- 2.  Made from living or once-living organisms
 
- 3.  A woody perennial plant, typically having a single stem or trunk growing to a considerable height and bearing lateral branches
 
- 4.  A thin layer of air that surrounds a planet
 
- 5.  Often used in place of glass, metal, and wood
 
- 6.  A light, gentle flow of air
 
- 7.  A mixture of gases that forms the Earth's atmosphere
 
- 8.  The removal of vegetation from an area of land
 
- 9.  Natural home of an animal or plant
 
- 10. A large area of land that is densely covered with trees
 
- 11. A layer in the atmosphere which shields us from ultraviolet radiation
 
- 12. A liquid that covers 70% of the Earth's surface
 
- 13. The elements of the world, especially plants, animals, and landscapes
 
- 14. A structure with transparent walls and roof that is used to grow plants
 
- 15. Transforming waste into new items
 
- 16. A natural soil enhancer made from decaying plant and animal matter
 
- 17. The contamination of soil, air, or water by human activities
 
- 18. The atmospheric conditions of a region over a long period of time
 
- 19. Fith largest planet in the solar system
 
- 20. Found in all living organisms