hope this helps anyone

1. Nitrogen cycle
Done by:Yassin Mohamed
Class: 9H

2. The Nitrogen Cycle
about 78% of the atmosphere is made of nitrogen gas and most organisms
don’t use nitrogen in its gas form they use it in a form called ion such as
ammonium (NH4-) and nitrate (NO-3).

3. Nitrogen fixing bacteria and
nitrification
the nitrogen fixation bacteria can change nitrogen gas to ammonia through
this process (nitrogen fixation). Most of the nitrogen cycle happens under
ground by nitrogen fixing bacteria which in small outgrowths called nodules.
after nitrogen fixation, another bacteria turns ammonia into nitrates by a
process called nitrification. Nitrates are used by plants to make proteins.

4. How nitrogen is recycled
Nitrogen moves through the living organisms as one eats another. When
decomposers break down animal waste or dead animals or plants matter,
nitrogen is returned to the soil as ammonium in a process called
ammonification then nitrogen is released back into the atmosphere

5. Denitrifying bacteria
Denitrifying bacteria changes nitrate back into nitrogen gas which is released
back in the atmosphere. Some nitrogen also enters the soil as a result of
atmospheric fixation by lightning because it breaks apart nitrogen molecules
in the atmosphere then nitrogen combines with oxygen which forms nitrogen
oxide which forms nitrates with rainwaters then are absorbed by the soil.