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Atmosphere and Climate — Revision Notes

CBSE · Class 9 · Social Science

Atmosphere and Climate revision notes for CBSE Class 9 Social Science: 4 topics in quick points. Part of the CBSE Class 9 Social Science syllabus.

99 questions88 flashcards5 concepts

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Key Topics to Revise

1

1. Composition of the Atmosphere

  • The atmosphere is a mixture of gases, water vapour, and tiny dust particles.
  • Nitrogen and oxygen are the two primary and most abundant gases essential to life on Earth.
  • Carbon dioxide, argon, helium, neon, krypton, xenon, ozone, and hydrogen are present in smaller amounts.
2

2. Structure of the Atmosphere

  • The atmosphere has five main layers: troposphere, stratosphere, mesosphere, thermosphere, and exosphere.
  • Layers are identified by changes in temperature and density with height.
  • The troposphere has an average height of about 12 kilometres.
3

3. Weather, Climate, and Atmospheric Elements

  • Weather refers to the hour-to-hour and day-to-day condition of the atmosphere.
  • Climate refers to the sum total of weather conditions and variations over a large area for an extended period, usually thirty years or more.
  • Important elements of weather and climate are temperature, precipitation, humidity, wind, and atmospheric pressure.
4

4. Seasons in India

  • The Indian Meteorological Department has recognised four distinct seasons in India.
  • Winter generally lasts from December to early April.
  • Summer or pre-monsoon lasts from April to June, or up to July in north-western India.

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Full Notes

Key Concepts

The atmosphere contains mainly nitrogenThe atmosphere has five main layersThe troposphere is the lowestThe stratosphere lies above the troposphereThe mesosphere is the third layer

Frequently Asked Questions

What are the important topics in Atmosphere and Climate for CBSE Class 9 Social Science?
Key topics in Atmosphere and Climate include Composition of the Atmosphere, Structure of the Atmosphere, Weather, Climate, and Atmospheric Elements, Seasons in India. Study these first, then practise questions on each for Class 9 exams.
How should I revise Atmosphere and Climate for Class 9 exams?
Learn the core ideas first, then work through the 99 practice questions on Atmosphere and Climate. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All CBSE Class 9 Social Science Revision Notes

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