1. What is the most abundant gas in the air?
2. Which gas makes up about 21% of the Earth's atmosphere?
3. Which of the following is not a component of air?
4. What does the atmosphere protect us from?
5. What is the primary purpose of oxygen in the air?
6. Which gas is essential for photosynthesis in plants?
7. Which layer of the atmosphere protects us from harmful ultraviolet rays?
8. Which gas is responsible for global warming?
9. What is the primary source of oxygen in the atmosphere?
10. Which of the following gases is inert and does not support combustion?
11. What happens to the air as you go higher in the atmosphere?
12. Which layer of the atmosphere is closest to the EarthÂ’s surface?
13. Which of the following helps in the formation of winds?
14. Why do we feel breathless at high altitudes?