Biogeochemical Cycles

4. a colourless, odourless, tasteless, flammable gaseous substance that is the simplest member of the family of chemical elements.
6. the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage
7. a biogeochemical process through which nitrogen is converted into many forms, consecutively passing from the atmosphere to the soil to organism and back into the atmosphere
10. A nonmetallic element that is found in the blood, muscles, nerves, bones, and teeth and is a component of adenosine triphosphate
12. the process where water vapor becomes liquid
13. a chemical element that naturally occurs in all organic compounds and is found in all forms of life
14. the process by which nitrate is reduced to nitrogen gas by soil microbes when oxygen is not present
16. any liquid or frozen water that forms in the atmosphere and falls to Earth
17. the continuous movement of water within the Earth and atmosphere.

1. helps organisms grow, reproduce, and turn food into energy
2. the process that converts ammonium to nitrate
3. describes how carbon moves between the atmosphere, soils, living creatures, the ocean, and human sources
5. the process that changes liquid water to gaseous water
8. the process of water movement through a plant and its evaporation from aerial parts
9. any body of water found on Earth's surface
11. water that exists underground in saturated zones beneath the land surface
15. a naturally occurring element that is essential for growth and reproduction in both plants and animals