Planet Earth Crossword Puzzle

Advanced Earth Day-themed Crossword Puzzle

1. A molecule that is toxic to many organisms
2. A structure that traps heat and light from the sun to grow plants in a controlled environment
3. Derived from living sources
4. At risk of extinction
5. A large area of land with a lot of trees and plants
6. A material that is often used for packaging
7. Earth's main source of energy
8. Third planet from the sun
9. Used for drinking, washing, and growing food
10. The medium that carries sound waves
11. The state of the atmosphere in a given region
12. The environment and its features
13. Reducing waste and pollution
14. A color between blue and yellow
15. The physical and biological factors that influence the life of an organism
16. A resource that can be replaced
17. A protective layer of gas around a planet
18. A component of coal and diamonds
19. A woody plant that typically has a single trunk and many branches
20. To use something again after it has been used up
21. Air in motion