Across
- 3. process where plants use sunlight to make their own sugar (glucose)
- 4. returning extra nitrogen into a usable form
- 5. when plants absorb water and nutrients from their environment
- 8. water vapor changes into liquid water
- 9. water falling from the sky
- 10. process where water evaporates from plant leaves into atmosphere
- 12. makes up about 80% of the earth's atmosphere
- 13. become fossil fuels after breaking down
- 14. nonrenewable energy sources (coal, oil, natural gas)
- 16. oxidation process where bacteria convert ammonia into nitrate
- 17. draining of water from an area of land
Down
- 1. light from the sun
- 2. produced by burning fossil fuels
- 3. any type of water released from a cloud on to earth
- 6. pollutants released from motor vehicles and industrial facilities
- 7. source of nitrogen for living organisms
- 11. biodegradable materials from plants or animals
- 15. process when liquid turns to gas once it reaches its boiling point