Q1
What percentage of the atmosphere is nitrogen?
AAbout 78%
BAbout 21%
CAbout 50%
DAbout 1%
ICSEClass 7 (ICSE)GeographyCh 3 · Topic 2
Practice and Revision - Composition of the Atmosphere
Let us practise and revise what we learned about composition of the atmosphere. The atmosphere is composed of a mixture of gases, mainly nit
Core concept
Nitrogen makes up about 78% of the atmosphere, while oxygen makes up about 21%, with the remaining 1% including gases like argon and carbon dioxide.
How it works
Water vapour, though present in small amounts, plays a crucial role in weather processes like cloud formation and precipitation.
Why it matters
Carbon dioxide, while a small percentage, is important for photosynthesis in plants and for regulating Earth's temperature.
Key detail
The composition of the atmosphere can vary slightly with altitude, location, and human activities like pollution.
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Quick notes
• Nitrogen is about 78% of the atmosphere.
• Oxygen is about 21%.
• The remaining 1% includes argon and carbon dioxide.
• Water vapour plays a role in weather processes.
• It's involved in cloud formation and precipitation.
• Carbon dioxide supports photosynthesis.
• It also regulates Earth's temperature.
• Composition can vary with altitude and pollution.