"Air" is a chapter from 7th grade NCERT Social Science textbook, ‘Our Environment’. The term 'air' is used to refer to the overall gas composition of the Earth's atmosphere. With oxygen, water vapour, argon, carbon dioxide, and other trace gases mixed in, nitrogen makes up most of this gas. All living things need air to survive. To understand the chapter completely and perform well in your school examinations, download the entire presentation.

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