Advanced Earth Day-themed Crossword Puzzle
 
Listed Items
- 1.  A mixture of gases that forms the Earth's atmosphere and is necessary for the respiration of living organisms
- 2.  Produced by a living organism
- 3.  Reusing resources to conserve energy
- 4.  In danger of vanishing
- 5.  A layer in the atmosphere which shields us from ultraviolet radiation
- 6.  The prevailing weather conditions of a region
- 7.  Found in all living organisms
- 8.  A woody plant with a single trunk and many branches
- 9.  The destruction of natural forests and woodlands
- 10. Fith largest planet in the solar system
- 11. A transparent or translucent structure to warm the air and protect plants from cold weather
- 12. Often used in place of glass, metal, and wood
- 13. The physical universe, including plants, animals, and landscapes
- 14. A liquid that covers 70% of the Earth's surface
- 15. A large area of land with many trees and other plants
- 16. The presence of harmful chemicals in the air, water, or land
- 17. A light, gentle flow of air
- 18. The envelope of gases that surrounds a planet
- 19. Place where a species can exist
- 20. Decomposing organic material used to fertilize plants and improve soil structure