Often it is water vapour, which can vary from 0 to 4 %. Otherwise it is argon, at nearly 1%
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Nitrogen is the most common element found in Earth's atmosphere, making up about 78% of the air we breathe. Oxygen is the next most abundant element in Earth's atmosphere, making up about 21%.
Nitrogen is the most prevalent gas in Earth's atmosphere, making up about 78% of the total composition. Oxygen is the second most abundant gas, at around 21%.
Nitrogen is the most common element in Earth's atmosphere, making up about 78% of the total volume. Oxygen is the second most abundant element, at approximately 21%.
The primary gas found in Earth's atmosphere is nitrogen, making up about 78% of the air we breathe. Oxygen is the second most abundant gas, making up about 21% of the atmosphere.
Nitrogen is the most abundant gas in Earth's atmosphere, making up about 78% of the air we breathe. Oxygen is the second most abundant gas, comprising about 21% of the atmosphere.