What happens to nitrogen as it passes through the nitrogen cycle

Denitrifying bacteria convert nitrates in the soil back to nitrogen gas.These gases dissolve in rain droplets to form nitrates that plants can use.

where is the scientific experiment?

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.