Chapter 2 of 10
Revision Notes
Atmosphere — Revision Notes
ICSE · Class 7 · Geography
Atmosphere revision notes for ICSE Class 7 Geography: 4 topics in quick points. Key terms: Air is mainly made up, Air has weight and The troposphere is.
42 questions38 flashcards5 concepts
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Key Topics to Revise
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1. Introduction to the Atmosphere
- The atmosphere is the layer of gases surrounding the Earth.
- It extends to a height of around 10,000 km from the Earth’s surface.
- It protects life from high-energy radiation and the vacuum of space.
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2. Composition of the Atmosphere
- The atmosphere is made mainly of nitrogen, oxygen, argon, carbon dioxide, and trace gases.
- Nitrogen is the largest component of the atmosphere.
- Oxygen is the second largest component.
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3. Atmospheric Pressure
- Atmospheric pressure varies from place to place and with height.
- Near the Earth’s surface, air pressure is highest because air is densest there.
- As height increases, air becomes thinner and pressure decreases.
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4. Structure of the Atmosphere
- The atmosphere has five main layers: troposphere, stratosphere, mesosphere, ionosphere or thermosphere, and exosphere.
- Each layer has different characteristics and functions.
- Weather phenomena mainly occur in the troposphere.
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Full NotesKey Concepts
Air is mainly made upAir has weightThe troposphere is the lowermost layerThe stratosphere is the second layerThe mesosphere lies from 50
Frequently Asked Questions
What are the important topics in Atmosphere for ICSE Class 7 Geography?
Key topics in Atmosphere include Introduction to the Atmosphere, Composition of the Atmosphere, Atmospheric Pressure, Structure of the Atmosphere. Study these first, then practise questions on each for Class 7 exams.
How should I revise Atmosphere for Class 7 exams?
Learn the core ideas first, then work through the 42 practice questions on 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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