The dominant gas in the Earth's atmosphere is nitrogen, which makes up about 78% of the atmosphere's composition. Oxygen follows, contributing around 21%, while other gases such as argon, carbon dioxide, and trace gases account for the remaining percentage. Nitrogen is a crucial component of the atmosphere, playing a role in various natural processes, including the nitrogen cycle, which is vital for plant growth and the overall health of ecosystems. The abundance of nitrogen helps to stabilize the atmosphere and prevent rapid combustion, allowing life to thrive. Understanding atmospheric composition is essential for studies related to climate change and environmental science.