- Carbon: This element is found in all organic life
- Carbon Oxygen Cycle: the continual process of transferring carbon between Earth's living organisms and Earth's geological elements
- Cellular Respiration: the process by which animals break down glucose into carbon dioxide and water
- Denitrification: the process by which bacteria convert nitrate back to Nitrogen
- Evaporation: The process by which surface liquid water is converted from a liquid to a gas
- Hydrologic Cycle: Another name for the water cycle
- Nitrogen Cycle: the pathway for the movement of the nitrogen among Earth's organism
- Nitrogen Fixation: a process whereby certain soil bacteria break down nitrogen and nitrogen found in in dead organic matter and convert it to wither nitrate or ammonia
- Phosphorous Cycle: One of the slowest biogeochemical cycle
- Photosynthesis: the process by which carbon dioxide is converted into carbohydrates
- Precipitation: Te process by which water return to the surface (rain. sleet, snow--etc)
- Transpiration: The process by which plants gives off water to the atmosphere
- Water Cycle: the continous circulation of water between earth's organisms, atmoshere and surface