Class 9 new ncert Chapter 3 SST Solution - Atmosphere and Climate
Q & A — 6th 7th 8th 9th 10th Chapter 3 : Atmosphere and Climate Question 1. What is the atmosphere? Write the composition of the atmosphere. Answer: The atmosphere is the blanket of air surrounding the Earth. It is a mixture of different gases and is held around the Earth by gravity. It is essential for the survival of all living beings. It also protects Earth from harmful solar radiation and helps regulate its temperature. The atmosphere is mainly made up of: Nitrogen – 78% Oxygen – 21% Argon – 0.93% Carbon dioxide – 0.04% Other gases – about 0.03% It also contains water vapour and tiny dust particles. Question 2. Name the major layers of the atmosphere. Answer: The five major layers of the atmosphere are: Troposphere Stratosphere Mesosphere Thermosphere Exosphere Question 3. Why is the troposphere important? Answer: The troposphere is the most important layer because: We breathe the air present in this lay...