Chapter 8 of 17
Revision Notes
Atmosphere — Revision Notes
Gujarat Board · Class 11 · Geography
Atmosphere revision notes for Gujarat Board Class 11 Geography: 4 topics in quick points. Part of the Gujarat Board Class 11 Geography syllabus.
45 questions24 flashcards5 concepts
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Key Topics to Revise
1
Composition of Atmosphere
- Atmosphere contains solid, liquid, and gaseous components including microscopic particles, salt particles, water droplets, and various gases
- Nitrogen (78%) is the most abundant gas, followed by Oxygen (21%), Argon (0.93%), and Carbon dioxide (0.03%)
- Carbon dioxide is the heaviest gas, concentrated up to 20 km height
2
Structure of Atmosphere
- Atmosphere divided into 4 layers based on temperature variations: Troposphere, Stratosphere, Mesosphere, Thermosphere
- Troposphere: 0-16 km (tropics), 0-12 km (temperate), 0-8 km (polar); contains 75% atmospheric gases
- Temperature decreases by 6.5°C per km height in troposphere
3
Weather and Climate
- Weather: short-term atmospheric conditions (morning, noon, evening, day)
- Climate: average weather conditions over 35+ years
- Weather depends on temperature, humidity, rainfall, air pressure, fog, cloud cover
4
Factors Affecting Climate
- Latitude: Most important factor - equatorial regions hot & humid, polar regions cold & dry
- Altitude: Temperature decreases by 6.5°C per km height; hill stations have pleasant climate
- Distance from sea: Coastal areas moderate climate, continental areas extreme climate
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Full NotesKey Concepts
The atmosphere consists of 78% NitrogenThe atmosphere has four main layersWeather refers to shortSeven main factors affect climateGlobal warming is the increase
Frequently Asked Questions
What are the important topics in Atmosphere for Gujarat Board Class 11 Geography?
Key topics in Atmosphere include Composition of Atmosphere, Structure of Atmosphere, Weather and Climate, Factors Affecting Climate. Study these first, then practise questions on each for Class 11 exams.
How should I revise Atmosphere for Class 11 exams?
Learn the core ideas first, then work through the 45 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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