Q1
What percentage of the atmosphere is nitrogen?
AAbout 78%
BAbout 21%
CAbout 50%
DAbout 1%
ICSEClass 7 (ICSE)GeographyCh 3 · Topic 1
Composition of the Atmosphere
The atmosphere is composed of a mixture of gases, mainly nitrogen and oxygen, along with other elements essential for life and weather.
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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• 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.