What is the most abundant gas in the Earth's atmosphere?
The most abundant gas in the Earth's atmosphere is nitrogen, making up about 78% of the total atmosphere. Oxygen is the second most abundant gas, comprising approximately 21% of the atmosphere. Other gases, such as argon, carbon dioxide, neon, and helium, make up the remaining 1%. The balance of these gases help regulate the Earth's climate and sustain life on the planet.
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