🌍 Class 7 Geography – Chapter 4
Air
NCERT Textbook Questions & Answers
Q1. What is atmosphere?
The atmosphere is a thick blanket of air that surrounds the Earth. It protects life on Earth by blocking harmful rays of the Sun and helping in maintaining temperature.
Q2. Which two gases make up the bulk of the atmosphere?
Nitrogen and oxygen make up the bulk of the atmosphere.
- Nitrogen – about 78%
- Oxygen – about 21%
Q3. Which gas creates greenhouse effect in the atmosphere?
Carbon dioxide creates the greenhouse effect in the atmosphere by trapping heat.
Q4. What is weather?
Weather refers to the day-to-day condition of the atmosphere at a particular place.
Q5. What is climate?
Climate is the average weather condition of a place over a long period of time.
Q6. Name the different layers of the atmosphere.
- Troposphere
- Stratosphere
- Mesosphere
- Thermosphere
- Exosphere
Q7. Why is troposphere the most important layer of the atmosphere?
The troposphere is the most important layer because:
- We live in this layer
- All weather changes occur here
- It contains dust and water vapour
Q8. What is air pressure?
Air pressure is the force exerted by the weight of air on the Earth’s surface.
Q9. How does air move?
Air moves from areas of high pressure to areas of low pressure. Moving air is called wind.
Q10. What are the causes of air pollution?
- Smoke from vehicles
- Factory emissions
- Burning of fossil fuels
Q11. How can air pollution be reduced?
- Planting more trees
- Using public transport
- Reducing use of fossil fuels
Clearly differentiate between weather and climate. Remember gas percentages and names of atmospheric layers in order.
Prepared by Shaktimatha Learning 🌟
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