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Chapter Summary

Atmosphere

ICSE · Class 7 · Geography

Summary of Atmosphere for ICSE Class 7 Geography. Key concepts, important points, and chapter overview.

42 questions38 flashcards5 concepts

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A pie chart showing the percentage composition of major gases in the Earth's atmosphere, primarily Nitrogen, Oxygen, and a small percentage of other gases like Argon and Carbon Dioxide.
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Overview

The atmosphere is the blanket of gases that surrounds Earth and extends to about 10,000 km from the surface. It protects life from harmful radiation and the vacuum of space. Air pressure and temperature both decrease with height. The atmosphere is made mostly of nitrogen and oxygen, with smaller amo

Key Concepts

Air is mainly made up

Air is mainly made up of nitrogen 78%, oxygen 21%, argon 0.93%, carbon dioxide 0.4%, and trace gases such as neon, helium, methane, krypton, ozone, hy

Air has weight

Air has weight, so it exerts pressure on Earth. Pressure decreases as altitude increases, at the rate of 1 cm for every 110 metres of ascent. Pressure

The troposphere is the lowermost layer

The troposphere is the lowermost layer of the atmosphere and the layer closest to Earth. It has an average height of about 14 km, but it is about 8 km

The stratosphere is the second layer

The stratosphere is the second layer and extends from 15 to 50 km between 50° and 60° latitudes. It is free of water vapour and dust. It contains the

The mesosphere lies from 50

The mesosphere lies from 50 to 80 km above Earth. Meteors burn up here and create shooting stars. It is called the Ignorosphere because little is know

Learning Objectives

  • Describe the importance of the atmosphere for life on Earth.
  • Explain the composition of the atmosphere.
  • Identify the five layers of the atmosphere and their main features.
  • Understand how weather happens in the troposphere.
  • Explain the greenhouse effect and its link with global warming.

Frequently Asked Questions

What are the important topics in Atmosphere for ICSE Class 7 Geography?
Key topics in Atmosphere include Atmosphere – Chapter Overview Mind Map, Atmospheric Structure and Composition Overview, Composition of the Atmosphere. These are the concepts ICSE Class 7 examiners draw on most — study them first, then practise related questions.
How to score full marks in Atmosphere — ICSE Class 7 Geography?
Understand the core concepts first, then work through the 42 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.

More resources for Atmosphere

All 10 chapters — ICSE Class 7 Geography Chapter Summary

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