Composition and Structure of the Atmosphere
ICSE · Class 9 · Geography
Summary of Composition and Structure of the Atmosphere for ICSE Class 9 Geography. Key concepts, important points, and chapter overview.
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The atmosphere is the envelope of air, gases, dust, and water vapour surrounding the Earth. It extends far above the Earth’s surface and is essential for life. It provides the gases needed for breathing and photosynthesis, supports weather, protects life from harmful ultraviolet rays, and helps keep
Key Concepts
The atmosphere is a relatively thin
The atmosphere is a relatively thin layer of gases, dust, and vapour surrounding the Earth up to about 10,000 km above the surface. Air is colourless,
Nitrogen makes up 78% of clean
Nitrogen makes up 78% of clean dry air and oxygen makes up 21%. Together they form about 99% of clean dry air. The remaining gases are about 1% and ar
Water vapour is a colourless
Water vapour is a colourless and odourless gaseous form of water that mixes completely with other gases. The amount of water vapour in air is called h
The troposphere is the lowermost atmospheric
The troposphere is the lowermost atmospheric layer where humans live. Its name means the region of mixing. Almost all weather phenomena occur here. It
The tropopause is the upper boundary
The tropopause is the upper boundary of the troposphere. It marks the level where the normal decrease in temperature with height changes. Its height i
Learning Objectives
- Understand the meaning of atmosphere and the main properties of air.
- Identify the main gases in the atmosphere and their importance.
- Describe the structural layers of the atmosphere and their features.
- Explain the formation and importance of the ozone layer in the stratosphere.
- Understand ozone depletion, its causes, and its harmful effects.
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