Across
- 3. the current rise in the average temperature
- 6. the state or process of rotting
- 8. carbon atoms travels to atmosphere to the Earth and back to the atmosphere
- 9. plants absorb in order to maintain life and growth
- 10. the upper layer of earth in which plants grow
- 12. substance that has no fixed size or shape
- 15. an individual animal, plant, or single-celled life form
- 18. life-supporting component of the air
- 21. constitute the upper trophic levels
- 22. chemical compound made up of molecules
- 23. a living thing that grows in earth
- 24. the using up of a resource
Down
- 1. non-renewable energy
- 2. a living organism that feeds on organic matter
- 3. important energy source in living organisms
- 4. a group of atoms bonded together
- 5. used to grow plants
- 7. the chemical process that occurs in plants
- 11. long-term shifts in temperatures
- 13. the total amount of greenhouse gases
- 14. things that can make their own food using
- 16. a molecule composed of 12 atoms of carbon
- 17. the process of burning something
- 19. the star around which the earth orbits
- 20. the action of breathing