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Which of the following gases is most abundant in the Earth's atmosphere?
Nitrogen
Oxygen
Argon
Carbon Dioxide
Nitrogen
Nitrogen is the most abundant gas in the Earth's atmosphere, making up approximately 78 percent of the air by volume. Oxygen is the second most abundant gas at roughly 21 percent, while other gases like argon and carbon dioxide comprise the remainder.
Nitrogen is the most abundant gas in the Earth's atmosphere, making up approximately 78 percent of the air by volume. Oxygen is the second most abundant gas at roughly 21 percent, while other gases like argon and carbon dioxide comprise the remainder.
The Earth's atmosphere is structured into five principal layersтАФtroposphere, stratosphere, mesosphere, thermosphere, and exosphereтАФwith permanent gases maintaining a nearly uniform concentration up to an altitude of 80 kilometers.
Nitrogen constitutes approximately 78 percent of the atmosphere by volume.
Oxygen is the second most abundant gas at nearly 21 percent.
Argon is the most abundant noble gas in the atmosphere at about 0.93 percent.
Carbon dioxide accounts for about 0.04 percent of the atmosphere and is vital for photosynthesis and the greenhouse effect.
Option B is incorrect because oxygen is the second most abundant gas.
Option C is incorrect because argon is a trace gas making up less than one percent.
Option D is incorrect because carbon dioxide is present only in trace quantities.
A is correct тАФ Nitrogen is the most abundant gas in the Earth's atmosphere, accounting for nearly 78 percent of the total volume.
Questions regarding atmospheric layers and the proportion of permanent gases are frequently tested together in physical geography sections of competitive exams.
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