AIR ncert_CLASS7

  • AIR is consist of :

  • OXYGEN-21%
  • NITROGEN-78%
  • CO2-0.03%
  • ARGON-0.93% 
  • OTHERS-0.04%

  • LAYERS OF ATMOSPHERE : 

    • TROPOSPHERE -13km 
    • STRATOSPHERE-50km contains OZONE layer in it
    • MESOSPHERE-80 KM Meteorites burn up in this air 
    • THERMOSPHERE -80-400 km helps in Radio Transmission 
    • EXOSPHERE - >400 km -contains Helium & Hydrogen 

    INSOLATION :  

    • Incoming solar energy intercepted by the Earth .The amount insolation decreases from EQUATOR towards POLE ,therefore temperature decreases from same manner  ,That is the reason Poles are covered with the SNOW 
    • Low temperature area is associated with cloudy skies and weather 
    • High pressure Areas are associated with clear and sunny skies 
    • AIR always moves from high pressure area to low pressure area
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