Biogeochemical Cycles Katelynn Goins

The Water Cycle
  • The water cycle is the process in which water precipitates as water or snow from the atmosphere onto the land, which then leads to drainage into streams and rivers, and then returns to the atmosphere by evaporation and transpiration.
  • There are no chemical reactions occurring as there are only physical changes.
  • The plants are considered organic compounds and the water is considered an inorganic compound.
  • Humans have impacted the water cycle in many ways. Some ways include groundwater mining, irrigation, urbanization, and deforestation.
The Nitrogen Cycle
  • The nitrogen cycle is when nitrogen is converted into various chemical forms as it goes through the atmosphere and land and water ecosystems.
  • Many chemical reactions occur during the nitrogen cycle: Nitrogen converts into ammonium, nitrate and nitrite convert into dinitrogen and nitrous oxide gas, ammonium converts into nitrate, and nitrogen that is incorporated into organic matter is converted back into inorganic matter.
  • Humans have impacted the nitrogen cycle in many ways. Some include the use of synthetic nitrogen fertilizers, increased levels of nitrate in waters, and by killing marine life.
The Carbon Cycle
  • The carbon cycle is the process in which carbon dioxide is absorbed by photosynthesis and then returned through the atmosphere by respiration, the decay of dead organisms, and by the burning of fossil fuels.
  • Chemical reactions that occur area photosynthesis, respiration, and the burning of fossil fuels.
  • Carbon dioxide is inorganic and decay from plants and animals is organic.
The Phosphorus Cycle
  • The phosphorus cycle is the process in which phosphorus moves through the lithosphere, hydrosphere, and biosphere.
  • Chemical reaction: The making of phosphates.
  • Phosphate is inorganic, phosphorus can be either organic or inorganic.




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