Atmosphere — Chapter Summary
ICSE · Class 7 · Geography
Summary of Atmosphere for ICSE Class 7 Geography. Key concepts: Air is mainly made up, Air has weight and The troposphere is.
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Overview
The atmosphere is the blanket of gases that surrounds Earth and extends to about 10,000 km from the surface. It protects life from harmful radiation and the vacuum of space. Air pressure and temperature both decrease with height. The atmosphere is made mostly of nitrogen and oxygen, with smaller amo
Key Concepts
Air is mainly made up
Air is mainly made up of nitrogen 78%, oxygen 21%, argon 0.93%, carbon dioxide 0.4%, and trace gases such as neon, helium, methane, krypton, ozone, hy
Air has weight
Air has weight, so it exerts pressure on Earth. Pressure decreases as altitude increases, at the rate of 1 cm for every 110 metres of ascent. Pressure
The troposphere is the lowermost layer
The troposphere is the lowermost layer of the atmosphere and the layer closest to Earth. It has an average height of about 14 km, but it is about 8 km
The stratosphere is the second layer
The stratosphere is the second layer and extends from 15 to 50 km between 50° and 60° latitudes. It is free of water vapour and dust. It contains the
The mesosphere lies from 50
The mesosphere lies from 50 to 80 km above Earth. Meteors burn up here and create shooting stars. It is called the Ignorosphere because little is know
Learning Objectives
- Describe the importance of the atmosphere for life on Earth.
- Explain the composition of the atmosphere.
- Identify the five layers of the atmosphere and their main features.
- Understand how weather happens in the troposphere.
- Explain the greenhouse effect and its link with global warming.
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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