Answer» Correct Answer - Option 2 : Oxygen
The correct answer is Oxygen. - Oxygen is the second most abundant gas in Earth's atmosphere.
- The air in Earth’s atmosphere is made up of approximately 21% oxygen.
- Oxygen will be almost in negligible quantity at a height of 120 km.
- Oxygen is the most abundant element on Earth's crust.
- The atmosphere is composed of gases, water vapour, and dust particles.
- Nitrogen is the most abundant gas in Earth's atmosphere.
- The composition of gases in Earth's atmosphere:
- Nitrogen(78.08%)
- Oxygen(20.95%)
- Argon(0.93%)
- Carbon dioxide(0.036%).
- Code to remember the composition of gases in Earth's atmosphere is NO AC(Nitrogen, Oxygen, Argon, Carbon dioxide).
- Hydrogen is the most abundant element in the universe.
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