What is the third most common gas found in the air we breathe ________ ?
Correct answer: D. Argon
- A. Hydrogen
- B. Neon
- C. Carbondioxide
- D. Argon
Explanation
After nitrogen and oxygen, argon is the third most abundant gas in dry air, making up about 0.93%. Carbon dioxide is much less abundant and continues to vary with emissions and natural processes.
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