Nitrogen /Water/Carbon Cycle

Learn about all these cycles

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The Nitrogen Cycle

Nitrogen Cycle-

1). Nitrogen Fixaction -a process in which Nitrogen in the atmosphere is converted into ammoniumor nitrogen dioxide, for example. Atmospheric Nitrogen or molecular nitrogen is relatively inert: it does not easily react with other chemicals to form new compounds.

2).Nitrogen Assimilation-

    Nitrogen assimilation is the formation of organic nitrogencompounds like amino acids from inorganic nitrogencompounds present in the environment. Organisms like plants, fungi and certain bacteria that cannot fix nitrogen gas depend on the ability to assimilate nitrate or ammonia for their needs.

3).Ammonification-The conversion of organic nitrogen to ammonium by the action of decomposers


    Nitrification is the biological oxidation of ammonia or ammonium to nitrite followed by the oxidation of the nitrite to nitrate. The transformation of ammonia to nitrite is usually the rate limiting step of nitrification. Nitrification is an important step in the nitrogen cycle in soil.


    Denitrification is a microbially facilitated process of nitrate reduction (performed by a large group of heterotrophic facultative anaerobic bacteria) that may ultimately produce molecular nitrogen (N2) through a series of intermediate gaseous nitrogen oxide products.

    Why do we need this cycle-We need the Nitrogen Cycle because the air we inhale is mostly Nitrogen without it we would die because your body needs Nitrogen.

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The Carbon Cycle

Carbon Cycle-

1).Carbon enters the atmosphere as carbon dioxide from respiration(breathing) and combusting(burning)

2).Carbon Dioxide is absorbed by producers to make carbohydrates in photosynthesis.

3).Animals feed on the plants. So,they pass the carbon compounds along the food chain. Most of the carbon the animals consume however is exhaled as carbon dioxide.This is through the process of respiration.

4).The dead organims are eaten by decomposers in the ground.The carbon that was in their bodies is then returned to the atmosphere as carbon dioxide.

Why do we need this cycle-Because animals produce carbon. Producers absorb that and release oxygen which is needed for our survival. Oxygen is used for respiration.

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The Water Cycle

1).Evaporation-This is when warmth from the sun causes water from oceans, lakes, streams, ice and soils to rise into the air and turn into water vapour (gas). Water vapour droplets join together to make clouds!

2.)-Condensation: This is when water vapour in the air cools down and turns back into liquid water.

3.)-Precipitation: This is when water (in the form of rain, snow, hail or sleet) falls from clouds in the sky.

4.)Collection: This is when water that falls from the clouds as rain, snow, hail or sleet, collects in the oceans, rivers, lakes, streams. Most will infiltrate (soak into) the ground and will collect as underground water.

Why do we need this cycle-The water cycle is powered by the sun's energy and by gravity. The sun kickstarts the whole cycle by heating all the Earth's water and making it evaporate. Gravity makes the moisture fall back to Earth.