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Biogeochemical Cycles

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by Natalie Rios on 2 April 2013

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Transcript of Biogeochemical Cycles

Biogeochemical Cycles By: Natalie Rios Water Cycle Evaporation Transpiration Precipitation All things need water. Water is continuously cycled through the biosphere. On Earth, water exists in 3 forms:
- solid
- liquid
- gas Evaporation occurs when the sun's energy heats water and transforms it into water vapor, which is gas. Transpiration occurs when water evaporates from a plants leaf. Condensation Condensation occurs when water vapor cools and turns back into a liquid, forming clouds. Precipitation occurs when water falls from clouds. For example:
- rain
- snow
- hail
- sleet Carbon and Oxygen Cycle Where does CO2 come from? What does CO2 make? Respiration Fossil Fuels Combustion Photosynthesis All living things contain carbon (C) Carbon dioxide, also known as CO2, comes from people or animals ( heterotrophs/ consumers). Carbon dioxide makes glucose (starch(sugar)) Humans and animals inhale oxygen, which is an important element for living things. Oxygen comes from producers (plants, autotrophs). For example, trees, flowers, etc. In photosynthesis it comes from the water producers receive. Fossil fuels are coal, oil, and gas. They are made of dead plant and animal matter and are usually found in the ground. With the help of decomposers, the dead matter is able to be found in the ground. Through combustion, fossil fuels are released into the soil. When fossil fuels are burned, they return to the atmosphere as carbon dioxide. Photosynthesis is a chemical reaction where green plants use water and carbon dioxide to store the sun's energy in glucose (sugar). Through this process, producers give out oxygen which animals or consumers then breathe in( respiration). H2O H2O H2O H2O H2O Transpiration condensation H2O Precipitation Evaporation Nitrogen Cycle Nitrogen Fixation Usable Forms of Nitrogen Compounds:
- nitrates
- nitrites
- ammonia Since consumers eat producers, the producers that they eat contain nitrogen. As they eat them, they also eat the nitrogen. The nitrogen helps make protein. Nitrogen helps determine the growth of the producers. Denitrification Nitrogen or N2 is the most abundant gas in the atmosphere. Nitrogen fixation is a process in which bacteria in the air, soil, and water changes the nitrogen in the atmosphere into a usable form for plants. Denitrification is the process in which bacteria changes nitrogen compounds back into nitrogen gas.
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