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Oxygen (~21%) is second to nitrogen (~78%) in the composition of Earth's atmosphere.

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What is the second largest gas component in the atmosphere?

The second largest gas component in the Earth's atmosphere is oxygen, which makes up about 21% of the atmosphere by volume. The primary component is nitrogen, accounting for approximately 78%. Other gases, such as argon, carbon dioxide, and trace gases, make up the remaining percentage. Oxygen is essential for respiration in most living organisms and plays a critical role in various chemical processes.


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