Across
- 5. water held underground
- 7. the way water moves across the ground - moves pollutants as well
- 8. a salt of phosphoric acid
- 10. process of converting nitrogen compounds into ammonia
- 11. - organic compounds that contain phosphorus
- 12. falling water in the form of rain, snow, sleet and hail
- 13. water vapor to liquid droplets which makes clouds
- 14. made from decomposing plants and animals
- 15. reducing nitrate and nitrite to gaseous forms of nitrogen
- 18. liquid to gas
- 20. when the water comes together to make lakes and ponds
- 21. substance that occupies space and has mass
- 22. measurable property of an isolated physical system does not change as the system evolves over time
Down
- 1. any natural or industrial process that causes free nitrogen
- 2. any of the natural pathways by which essential elements of living matter are circulated
- 3. water vapor released from plants and ground
- 4. absorption and digestion of food or nutrients
- 6. sum of all process of moving water from land to air
- 9. gases that trap the suns heat in the atmosphere
- 16. water seeping into the ground
- 17. water going from soil into ground water
- 19. breaking down or dissolving of rocks