The nitrogen in Earth's atmosphere comes from volcanic outgassing and biological processes, while oxygen is produced by photosynthesis. Argon originates from the radioactive decay of potassium in the Earth's crust.
In the context of the Earth's atmosphere, the nitrogen (N2) primarily comes from the outgassing of nitrogen-containing compounds from Earth's interior through volcanic activity. Subsequently, biological processes involving nitrogen-fixing bacteria have also contributed.
Oxygen (O2) originated from the process of photosynthesis in plants and microorganisms, which have been converting carbon dioxide and water into oxygen and glucose for billions of years.
Argon (Ar), a noble gas, mainly originates from the decay of potassium-40 to argon-40 in Earth's crust, which then accumulates in the atmosphere.
The complete question is- Where did this nitrogen come from? - where did the oxygen come from? - where did the argon come from?