6. Air
The chapter discusses the composition and importance of air in supporting life and environmental balance. It explores air pollution, its causes and effects, and the role of greenhouse gases in climate change. Additionally, measures for conservation and pollution control are outlined to promote a cleaner atmosphere.
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Sections
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What we have learnt
- Air is a mixture of gases essential for life and environmental stability.
- Air pollution significantly impacts health, agriculture, and climate.
- Conservation measures are crucial in mitigating air pollution and its effects.
Key Concepts
- -- Composition of Air
- Air comprises nitrogen (78%), oxygen (21%), argon (0.93%), carbon dioxide (0.03%), and trace amounts of other gases, along with varying water vapour and dust.
- -- Air Pollution
- The introduction of harmful substances into the atmosphere, which can cause serious health and environmental issues.
- -- Greenhouse Effect
- The warming of the Earth due to greenhouse gases trapping heat in the atmosphere, which is necessary in moderation but harmful in excess.
- -- Ozone Layer
- A protective layer in the stratosphere that absorbs harmful ultraviolet radiation from the sun.
Additional Learning Materials
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