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  • We are surrounded by a thin layer of air around us.
  • This layer extends upto many kilometres above the surface of the earth and is known as atmosphere.
  • As we move higher in the atmosphere this air gets rarer.
  • Thus, mountaineers carry oxygen cylinders with them to use at higher altitudes.

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo