प्रश्न 1. वायुमंडल में कौन-कौन-सी गैसें होती हैं?
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Nitrogen — 78 percent.
Oxygen — 21 percent.
Argon — 0.93 percent.
Carbon dioxide — 0.04 percent.
Trace amounts of neon, helium, methane, krypton and hydrogen, as well as water vapor.
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