Biology Terms

1. An element essential to sustaining life largely through phosphates
5. The cycle of carbon being reused involving photosynthesis, respiration, and combustion
7. A naturally abundant, nonmetallic element that occurs in all organic compounds and can be found in all known forms of life
9. The process by which bacteria in soil and water oxidize ammonia and ammonium ions and form nitrites and nitrates
11. A nonmetallic element that is the simplest and lightest of the elements and that is normally a colorless odorless highly flammable diatomic gas
14. Any body of water above ground, including streams, rivers, and lakes
15. The cycle of nitrogen consecutively passing from the atmosphere to the soil to organism and back into the atmosphere
16. The process by which nitrate is reduced to nitrogen gas by soil microbes when oxygen is not present
17. When water vapor comes together and condenses

2. When water goes from clouds to small pieces of ice that fall from the clouds
3. A gas that makes up about 20% of our atmosphere
4. When water heats up to a point of where it turns to a gas
6. The cycle of water involving evaporation, condensation, and precipitation
8. fresh water that soaks into the soil and is stored in the tiny spaces between rocks and particles of soil
10. The process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers
12. A naturally occurring element that is essential for growth and reproduction in both plants and animals
13. The conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage