How much percentage of nitrogen consist in Earth's Atmosphere?A. 25%.
Earth atmosphere consists of a layer of gases. It is known as air. The composition of Dry air contains; 78.09% of Nitrogen(N2), 20.95% of Oxygen (O2), 0.93% of Argon (Ar) and 0.04% of Carbon dioxide(CO2).
Also, it contains small amounts of other gases like; helium, neon, krypton, hydrogen and water vapour.