Across
- 1. when a plant uses water sunlight and carbondioxide for food and generates oxygen
- 5. forms 78 percent of the worlds atmosphere
- 6. a gas that cannot be liquified
- 9. ghg that is emitted by burning fossil fuels
- 10. flammable and is used as fuel worldwide
- 12. a property of the physical body
- 13. multiple gases that all go as a whole
- 16. a toxic gas with bad odor that is formed by ultraviolet light
Down
- 2. also known as heat energy
- 3. essential to living creatures
- 4. can be produced by boiling liquids
- 7. carbondioxide methane nitrousoxide
- 8. the most stable of gases
- 11. gasses surrounding the earth
- 14. mostly gas but is also 21 percent of the atmosphere
- 15. they control our environment