Across
- 5. A continental landmass
- 6. Makes up 78% of earths atmosphere
- 7. A rock which can be burned into a fossil
- 9. A liquid derived from petroleum
- 11. The act of heat increasing
- 13. A gas that absorbs and emits energy
- 14. Combination of elements or qualities
- 17. Causes global warming with toxic fumes
- 19. The envelope of gases surrounding earth
- 20. A colorless unstable toxic gas
- 22. A powerful greenhouse gas, flammable
- 23. Also known as laughing gas
Down
- 1. Region of ozone formation in the atmosphere
- 2. High density that occurs naturally in the
- 3. A property that is transferred to an object
- 4. The emission of energy in forms of waves
- 5. Fuels create this in the air, harmful
- 8. Makes up 21% of earths atmosphere
- 10. Big piles of trash that harm air
- 12. First layer above earths surface
- 15. The highest layer in the atmosphere
- 16. A state of matter with no fixed shape
- 18. Coldest layer in the atmosphere
- 19. Envelope of gases surrounding the earth
- 21. An energy source produced by humans