Where does nitrogen in the atmosphere come from

Answer:80% of the molecules in Earth's atmosphere are made of two nitrogen atoms bonded together (not sure though)

Nitrogen makes up 78 per cent of the air we breathe, and it's thought that most of it was initially trapped in the chunks of primordial rubble that formed the Earth. When they smashed together, they coalesced and their nitrogen content has been seeping out along the molten cracks in the planet's crust ever since.