Earth Day Crossword

Advanced Earth Day-themed Crossword Puzzle

1. Decayed plant and animal material used to improve soil
2. A building made of glass or plastic to keep plants warm and sheltered from the elements
3. A synthetic material made from a wide range of organic polymers
4. The geographical area where a particular species is located
5. A building block of organic molecules
6. A color often used to represent jealousy
7. A resource that can be used over and over
8. The introduction of contaminants into the air, water, or soil
9. In danger of becoming extinct
10. Derived from living sources
11. Covers 70% of Earth's surface
12. A sphere made of land and water
13. A plant with a trunk and branches that grows from a seed
14. A molecule that is toxic to many organisms
15. The average weather of a region over a period of time
16. The physical and biological factors that affect the life of an organism
17. The physical world and all living things
18. A large area of land covered with trees and other plants
19. The air around the Earth which contains oxygen and other gases
20. The medium that carries sound waves