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Composition and Structure of Atmosphere

ICSE · Class 11 · Geography

Quick revision notes for Composition and Structure of Atmosphere — ICSE Class 11 Geography. Key concepts, formulas, and definitions for last-minute revision.

64 questions38 flashcards5 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?
Composition and Structure of Atmosphere covers several key topics that are frequently asked in ICSE Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Composition and Structure of Atmosphere — ICSE Class 11 Geography?
Understand the core concepts first, then work through the 64 practice questions available for this chapter. Revise formulas and 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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