Answer:
Stage 1 - Nitrogen fixation:
The light will provide energy for the N2 in the atmosphere react with the Oxygen, producing NO and NO2, so when the rain or the snow comes, these molecules will enter the soil.
Stage 2 - Mineralization:
Some microbes will take this NO and NO2 and will turn it into NH3, that is called ammonia. After that, the ammonia will react with the water from the soil and will form NH4, that is called ammonium.
Stage 3 - Nitrification:
The stage 3 also occurs in the soil, is when the ammonium is converted in coumponds called nitrites and nitrates by bacterias (respectively NO2- and NO3-), and now these nitrites and nitrates are ready for the plants consume it.
Stage 4 - Immobilization:
There are some microorganisms in the soil that also need of Nitrogen. These microorganisms take the excess of NH4 and NO3- and uses it to their own survivor. That part of the cycle helps to control the amount of nitrogen in the soil, cause excess of nitrogen can be dengerous for plants
Stage 5 - Denitrification:
The denitrification is the last stage, when some bacterias convert the nitrates into N2 again and it returns to the atmosphere the restart the cycle