Which is the major nitrogen reservoir on Earth?

Question

Quizplus · Accepted Answer

The major nitrogen reservoir on Earth is the atmosphere, which is composed of 78% nitrogen gas (N2). While plants and microbes also play important roles in the nitrogen cycle, they contain only a small fraction of the total nitrogen on Earth, and most of the nitrogen they store is eventually returned to the atmosphere in the form of N2. The ocean biomass and organic matter in soil also contribute to the nitrogen cycle, but are not major reservoirs.

Which Is the Major Nitrogen Reservoir on Earth