What are the top two gases found in the atmosphere?

The top two gases found in the Earth's atmosphere are nitrogen, which makes up about 78% of the atmosphere, and oxygen, accounting for approximately 21%. Together, these two gases dominate the atmospheric composition, with trace amounts of other gases such as argon, carbon dioxide, and water vapor making up the remainder. Nitrogen plays a crucial role in various biological processes, while oxygen is essential for respiration in most living organisms.