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What are the Nitrogen Cycles?
The Earth's atmosphere is made of 78 percent nitrogen. Nitrogen is a key element in nearly all biological molecules, including nucleic acids, amino acids and enzymes. Without it, life would be impossible. However, no plant or animal can directly absorb... More »
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simple.wikipedia.org/wiki/Nitrogen_cycle

The nitrogen cycle is the way that nitrogen in nature is changed into many different forms that are used by living organism[s]. Air is about 78% nitrogen. Nitrogen ...

en.wikipedia.org/wiki/Nitrogen_cycle

The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into various ... A simple diagram of the nitrogen cycle. The blue boxes represent ...

www.ducksters.com/science/ecosystems/nitrogen_cycle.php

Kids learn about the nitrogen cycle and how this nutrient travels through the ecosystem to sustain life on Earth.

peer.tamu.edu/curriculum_modules/Environ_Hazard/module_1/lesson5.htm

The Chemical Cycles. The Nitrogen Cycle Organisms require nitrogen to produce amino acids. Nitrogen makes up seventy-eight percent of the atmosphere, but ...

www.cas.miamioh.edu/mbi-ws/biogeochemicalcycles/Nitrogen/nitrogen.htm

Overview: The nitrogen cycle involves three major steps: nitrogen fixation, nitrification, and denitrification. It is a cycle within the biosphere which involves the ...

www.siue.edu/~rbrugam/Nitrogen.pdf

Step 4- Denitrification- Denitrification is the final step in which other bacteria convert the simple nitrogen compounds back into nitrogen gas (N2 ), which is then ...

eschooltoday.com/ecosystems/the-nitrogen-cycle.html

Nitrogen is also key in the existence of ecosystems and food chains. Nitrogen forms about 78% of the air on earth. But why is this cycle so important in ...

www.kidsgeo.com/geography-for-kids/0161-the-nitrogen-cycle.php

Nitrogen is used by lifeforms to carry out many of the functions of life. This element is especially important to plant life. Yet, nitrogen in its gaseous form is almost ...

www.sciencelearn.org.nz/resources/960-the-nitrogen-cycle

Jul 30, 2013 ... Nitrogen is the most abundant element in our planet's atmosphere. ... group of nitrogen-containing organic molecules including simple amino ...