What is the approximate composition of the atmosphere in terms of nitrogen and oxygen?

The atmosphere is primarily composed of nitrogen and oxygen, with nitrogen making up about 78% of the total atmosphere and oxygen approximately 21%. This composition is crucial for supporting life on Earth; nitrogen is relatively inert and serves as a stable gas, while oxygen is essential for respiration in most living organisms. The remaining 1% includes other gases such as carbon dioxide, argon, and trace gases, which also play important roles in various biological and chemical processes on our planet.

The provided composition reflects well-studied measurements of atmospheric gases and is significant for understanding weather patterns, climatic changes, and the overall dynamics of the Earth's atmospheric system.