Biogeochemical Cycles Monica DiLisio

The Water Cycle
  • The water cycle determines the movement of water throughout the Earth. It helps decide the state of matter the water would be. Earth's water is stored in 96.5% of the worlds ocean. The transpiration rate is effected by temperature, relative humidity, wind and air movement, soil-moisture availability, and type of plant.
  • There are no chemical reactions occurring in the water cycle.
  • Plants in the water cycle are considered organic components, while the water is the inorganic component in the water cycle.
  • Humans interact with the water cycle by collecting the run off water for their own uses. By doing that humans change the amount of surface area and the location of the water.
The Nitrogen Cycle
  • Nitrogen goes towards the building blocks of proteins, DNA, and RNA. The Nitrogen Cycle has five parts to it: Nitrogen Fixation, Denitrification, Nitrification, Nitrogen Mineralization, and Nitrogen Uptake.
  • The chemical reactions involved are N2 -> NH4+, NO3 & NO2 -> N2 (as well as NO2). The chemicals used are NO3 (nitrate), NO2 (nitrite), NH4+ (ammoium).
  • When in the atmosphere the nitrogen is inorganic because the strong triple bond makes it nonreactive to living organisms. Nitrogen is organic throughout the reaction, but then goes back to inorganic at the end of it until it starts a new reaction.
  • Humans have an impact by using synthetic nitrogen fertilizers, which can wash off of the fields and end up in the ground water (which is a drinking water source).
Carbon Cycle
  • The carbon cycle makes up all of the living things on the Earth. Carbon connects to oxygen and becomes carbon dioxide while traveling the cycle. Carbon helps with the growing of plants as well as becoming carbon dioxide to be a greenhouse gas (which traps heat).
  • The cellular respiration is apart of the chemical reaction in the carbon cycle, C6H12O6 (organic matter) + 6O2 ⇒ 6CO2 + 6H2O + energy. Photosynthesis goes along with the plants and the chemical reaction to it is, Energy (sunlight) + 6CO2 + H2O ⇒ C6H12O6 + 6O2.
  • The organic components would be the plants, animals, and humans. The inorganic components would be the dead and decaying organisms in the cycle.
  • Humans contribute to the carbon cycle by exhaling carbon dioxide and giving it to plants, then plants give oxygen back out.
The Phosphorus Cycle
  • The cycle moves phosphorus throughout rocks, water, the soil, and organisms. It is a biochemical process (chemical processes).
  • Chemical Reactions: Substitution reactions, Oxidation reactions, addition reactions, elimination, oxidative.
  • Phosphorus is the inorganic component, when it is taken in by a plant it becomes an organic component.
  • Humans use fertilizers and raise livestock (and the waste from the livestock) which are high in phosphorus.

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