Which gas makes up over 75% of the Earth’s atmosphere?
Answer: The Earth’s atmosphere consists of a layer of different gases held in place by gravity. The Earth’s atmosphere is primarily made up of nitrogen, oxygen and argon. The most abundant gases in the atmosphere are nitrogen at 78 percent and oxygen at 21 percent, while the trace gases methane, neon and helium make up around one-tenth of 1 percent of the atmosphere. Together, nitrogen and oxygen compose 99 percent of the atmosphere’s volume.
Nitrogen is a chemical element with symbol N and atomic number 7. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772.