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Composition and Structure of Atmosphere — Revision Notes

ICSE · Class 11 · Geography

Composition and Structure of Atmosphere revision notes for ICSE Class 11 Geography: 4 topics in quick points. Part of the ICSE Class 11 Geography syllabus.

64 questions38 flashcards2 formulas & key relations5 concepts

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Key Topics to Revise

1

Meaning and Nature of the Atmosphere

  • The atmosphere is the vast expanse of air that envelopes the Earth all around.
  • It is an integral part of the Earth because of gravitational force.
  • The atmosphere is colourless, odourless, and tasteless.
2

Composition of the Atmosphere

  • The atmosphere is a mixture of many gases along with water vapour and dust particles.
  • Nitrogen forms 78.03% of atmospheric volume and is the largest constituent.
  • Oxygen forms 20.99% of atmospheric volume and is the life-giver gas.
3

Important Gases in Detail

  • Nitrogen is the largest gas in the atmosphere and extends to a height of 128 km.
  • Nitrogen avoids quick burning and helps in plant protein formation.
  • Oxygen is called the life-giver gas because it is essential for breathing and burning.
4

Structure of the Atmosphere

  • The atmosphere is divided into five main layers: troposphere, stratosphere, mesosphere, ionosphere, and exosphere.
  • Each layer differs in density and temperature.
  • Troposphere is the lowermost layer and the most important layer for human life and weather.

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Full Notes

Key Concepts

The atmosphere is the vast layerDry air mainly contains nitrogen (78Nitrogen is the largest componentOxygen is the lifeCarbon dioxide forms only 0

Frequently Asked Questions

What are the important topics in Composition and Structure of Atmosphere for ICSE Class 11 Geography?
Key topics in Composition and Structure of Atmosphere include Meaning and Nature of the Atmosphere, Composition of the Atmosphere, Important Gases in Detail, Structure of the Atmosphere. Study these first, then practise questions on each for Class 11 exams.
How should I revise Composition and Structure of Atmosphere for Class 11 exams?
Learn the core ideas first, then work through the 64 practice questions on Composition and Structure of Atmosphere. 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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