Composition and Structure of Atmosphere
Uttar Pradesh Board · Class 11 · Geography
Summary of Composition and Structure of Atmosphere for Uttar Pradesh Board Class 11 Geography. Key concepts, important points, and chapter overview.
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Overview
The atmosphere is a life-sustaining envelope of gases surrounding Earth that is essential for all living organisms. While we can survive days without food and hours without water, we cannot survive even minutes without breathing air. This protective layer contains vital gases like oxygen for humans
Key Concepts
The atmosphere is a mixture
The atmosphere is a mixture of gases (99% of mass within 32 km height), water vapour, and dust particles. Major gases include nitrogen, oxygen, carbon
A meteorologically important gas that
A meteorologically important gas that is transparent to incoming solar radiation but opaque to outgoing terrestrial radiation. It absorbs and reflects
Found between 10
Found between 10-50 km above Earth's surface, primarily in the stratosphere. Acts as a natural filter that absorbs harmful ultraviolet rays from the s
A variable gas that decreases
A variable gas that decreases with altitude and varies from 4% in warm, wet tropics to less than 1% in dry, cold regions. Acts like a blanket, absorbi
The atmosphere is divided into five
The atmosphere is divided into five layers based on temperature variations: Troposphere (0-13 km), Stratosphere (13-50 km), Mesosphere (50-80 km), The
Learning Objectives
- Understand the importance of atmosphere for life on Earth
- Learn about the composition of atmosphere including various gases, water vapour, and dust particles
- Analyze the role of different atmospheric gases like oxygen, carbon dioxide, ozone, and water vapour
- Examine the structure of atmosphere and its different layers
- Understand the characteristics and significance of each atmospheric layer
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