Q1
What is air mainly composed of?
ANitrogen and oxygen
BOnly carbon dioxide
COnly argon
DOnly water vapour
ICSEClass 7 (ICSE)ScienceCh 14 · Topic 2
Practice and Revision - Air and the Atmosphere
Let us practise and revise what we learned about air and the atmosphere. Air, a mixture of gases forming the atmosphere, is essential for li
Core concept
Air is mainly nitrogen (78%) and oxygen (21%), with smaller amounts of carbon dioxide, argon, and water vapour.
How it works
The atmosphere has distinct layers, with the troposphere (closest to Earth) being where weather occurs and where we live and breathe.
Why it matters
The ozone layer, in the stratosphere, absorbs most of the Sun's harmful ultraviolet radiation, protecting living things.
Key detail
Air pollution, from sources like vehicles and factories, can harm air quality, human health, and the broader environment.
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Quick notes
• Air is mainly nitrogen (78%) and oxygen (21%).
• Other gases include carbon dioxide, argon, water vapour.
• The troposphere is closest to Earth.
• Weather occurs in the troposphere.
• The ozone layer is in the stratosphere.
• It absorbs harmful ultraviolet radiation.
• This protects living things.
• Air pollution harms health and environment.