Atmosphere
Gujarat Board · Class 11 · Geography
Quick revision notes for Atmosphere — Gujarat Board Class 11 Geography. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
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
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
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
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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What are the important topics in Atmosphere for Gujarat Board Class 11 Geography?
Atmosphere covers several key topics that are frequently asked in Gujarat Board Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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