Ch – 4 Air

Priya's Learning Centre

  • Our earth is surrounded by a huge blanket of air called atmosphere.
  • Nitrogen (78%) and oxygen (21%) are two gases which make up the bulk of the atmosphere.
  • Carbon dioxide, helium, ozone, argon and hydrogen are found in lesser quantities.
  • Carbon dioxide released in the atmosphere creates a green house effect by trapping the heat radiated from the earth. It is therefore called a greenhouse gas
  • Atmosphere has 5 layers. They are:
    • Troposphere
    • Most important layer
    • Average height is 13 km
    • Weather phenomena occurs here
    • Stratosphere
    • Extends up to 50 km
    • Ideal for flying aeroplanes
    • Contains ozone layer
    • Mesosphere
    • Extends up to 80 km
    • Meteorites burn in this layer
    • Thermosphere
    • Extends between 80-400 km
    • Temperature increases with height
    • Helps in radio transmission
    • Exosphere
    • Light gases like helium and hydrogen float here
  • Weather is this hour-to-hour, day to day condition of the atmosphere.
  • The average weather condition of a place…

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Published by Priya Prakash

In the midst of winter, i found there was within me an invincible summer ~ Albert Camus

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