Biogeochemical Cycles Craig Matta

The water starts out in the evaporation stage, that is when the warmth from the sun heats up the water from earth and the water rises into the air. The next step is condensation, that is when the evaporated water cools off and turns back into a liquid. After it turns into a liquid it precipitates and falls from the clouds in the form of rain, snow, hail, sleet. Once the water or snow hits the ground it then gets collected in lakes, rivers, and oceans and gets soaked up into the ground as groundwater.

Chemical compounds of the water cycle:

Water- H2O

The water cycle is all inorganic. If the plants took in the water then it will turn that step into an organic step in the cycle.

The effects that humans have on the water cycle are irrigation, urbanization, deforestation and a lot of other things that humans do to effect the water cycle.

Nitrogen Cycle

The Nitrogen Cycle is Nitrogen in the air being fixed with compounds in the soil or water then taken up by animals and plants.

Chemical reactions in the nitrogen cycle

N2 is combined with H2 to create NH3

Decomposers release NH4 into the soil

Changing Ammonia and Ammonium into NO2 then NO3

When there is no oxygen bacteria turns the gas into N2 and starts the process over

Chemical Compounds


Nitrite- NO2-

Nitrogen in atmosphere- N2

nitrate- NO3-

Humans effect the nitrogen cycle by laying down fertilizers that are bad for the soil and that does not let the soil collect oxygen. It also gets effected by cars that give off pollution that soil can take in.

All forms of the nitrogen cycle have no organic material in it there is no carbon. The lants and animals that take part in the cycle are organic parts in the cycle but the cycle without them in it is inorganic.

The burning of fossil fuels is one of the biggest problems that the humans put on the nitrogen cycle. It hurts the cycle in almost every aspect and it can sometimes effect the cycle by not letting it complete. There are alot of other problems that humans cause but burning of fossil fuels is the biggest.

Carbon Cycle

The carbon cycle is when carbon is in the atmosphere then enters plants and organisms and finally gets released into the atmosphere.

The chemical reactions involved in the carbon cycle

Photosynthesis- Plants use carbon dioxide to produce oxygen

metabolism- oxygen is used and carbon dioxide is a product


Carbon Dioxide- CO2

Calcium Carbonate- CaCo3

There are organic compounds in the cycle such as coal, petroleum, and natural gas there are no inorganic products in the cycle.

The main problem that humans put n the carbon cycle are the poor agriculture choices people make that affect the land and soil. Carbon need to go into the plants so the plants can release oxygen and poor fertilizers or deforestation will kill the plants and they can not take up the oxygen

Phosphorous Cycle

Phosphorous moves in rocks and sediment then over time rain and minerals release ions which is collected by the soil and water then plants take up the phosphate from the soil.

Chemical compounds in the Phosphorous cycle

ATP- adenosine triphosphate

DNA and Lipids- Fats and oils

Chemical reactions

Low concentration of P in soil reduces the plants growth The P is a big part in the cycle and can determine how the cycle will turn out.

The organic parts in the phosphorous cycle is the bacteria that takes place in the cycle. There is also organic sulfur that happens in the cycle there are no inorganic parts in the cycle.

Humans affect the phosphorous cycle because they raise livestock especially pigs and that can affect the cycle. Also a big part of the affects is fertilizers and that is an affect on almost all the cycles .


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