Atmosphere and Climate — Chapter Summary
CBSE · Class 9 · Social Science
Summary of Atmosphere and Climate for CBSE Class 9 Social Science. Part of the CBSE Class 9 Social Science syllabus.
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Overview
The atmosphere is a blanket of air surrounding Earth. It protects life by filtering harmful solar radiation, helps regulate temperature, and creates weather and climate. Climate describes the average weather of a place over a long period, usually thirty years or more. India has a tropical monsoon cl
Key Concepts
The atmosphere contains mainly nitrogen
The atmosphere contains mainly nitrogen and oxygen. Smaller amounts of carbon dioxide, argon, helium, neon, krypton, xenon, ozone, and hydrogen are al
The atmosphere has five main layers
The atmosphere has five main layers: troposphere, stratosphere, mesosphere, thermosphere, and exosphere. These layers are identified by changes in tem
The troposphere is the lowest
The troposphere is the lowest and most important layer, with an average height of about 12 kilometres. Air, water vapour, clouds, and almost all weath
The stratosphere lies above the troposphere
The stratosphere lies above the troposphere and extends up to 50 kilometres. It is free from clouds and weather disturbances, so it is suitable for fl
The mesosphere is the third layer
The mesosphere is the third layer and extends up to 80 kilometres. Temperature decreases with altitude here, and most meteorites burn up in this layer
Learning Objectives
- Understand the composition of the atmosphere and the role of its gases
- Identify the major layers of the atmosphere and their main features
- Distinguish between weather and climate
- Explain how air pressure and wind are related
- Describe the two monsoon systems in India and their effects
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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