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ICSE Class 7 Answered

composition of atmosphere
Asked by pampa.mondal2008 | 10 Jul, 2022, 09:01: PM
Expert Answer
  • The atmosphere is made of many gases and solid particles. Nitrogen and oxygen are the two major gases which are present in the atmosphere. Nitrogen makes up 78% of the total volume of the atmosphere.
  • Oxygen is the second most abundant gas in the air. It is also known as the life-giving gas as it is inhaled by human beings and animals and is essential for their survival. Gases such as argon and carbon dioxide and water vapour constitute the remaining one percent of the total volume of the atmosphere.
  • Carbon dioxide which is present in the atmosphere in small quantities is used by plants to make food. It absorbs heat and keeps the Earth warm during the night. 
  • Water vapour is added to the atmosphere by evaporation and the process of transpiration by plants. All forms of precipitation are caused by water vapour present in the atmosphere. Many particles such as dust, pollen and ash produced from meteorites and smoke are also present in the atmosphere.
 
 
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