• The envelope of gases surrounding the earth is called the atmosphere.
  • It forms a protective boundary between the outer space and the biosphere.
  • It is a mixture of gases that is odorless, colourless, tasteless and formless mixed and blended so thoroughly that it acts like a single gas.
  • The gases of the present atmosphere are not the direct residue of the early stage of earth’s formation.
  • They are a product of progress through volcanic eruptions, hot springs, chemical breakdowns of solid matter and redistribution from biosphere.

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