Across
- 2. Caused by e.g. sulphur dioxide in the air (4,4)
- 6. Gas produced by cows that is in the atmopshere (7)
- 7. Finite resources that we burn to give us energy (6,5)
- 8. e.g. polymers; often ends up in the ocean (7)
- 11. Process of burning, that gives out carbon dioxide (10)
- 13. Another word for decay (13)
Down
- 1. The element that makes up most of our air (8)
- 3. Type of combustion that gives off carbon monoxide (10)
- 4. This process takes in carbon dioxide and gives out oxygen (14)
- 5. Process that gives out carbon dioxide, as will as energy (11)
- 9. Used to be made of mainly carbon dioxide; now has a variety of different gases (10)
- 10. Type of effect that traps certain gases on Earth (10)
- 12. Made of three oxygen atoms, this is a greenhouse gas (5)