Across
- 2. Layers of gases surrounding a planet.
- 4. Anything that surround us.
- 7. These are waste products of a process.
- 8. Substance made up of hydrogen and carbon.
- 9. Invisible gaseous surrounding the earth.
- 10. Building emitting toxic gases.
- 11. Action that will reduce emissions.
- 14. Energy that comes from natural sources.
- 16. Gas produced by burning carbon.
- 17. Main component of natural gas.
- 19. The rise of the planet temeperatures.
- 20. Ability to do work.
Down
- 1. Change in the average conditions.
- 3. Action of polluting.
- 5. A fluid that has neither shape or volume.
- 6. Coal and natural gas are exaples of this.
- 12. Sources that will run out.
- 13. Carbonized plant matter.
- 15. Presence of poisonous effects.
- 18. Method for obtaining liquid fossil fuels.