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The gaseous envelope which surrounds the earth and its rotating with it around its axis .
Atmospheric envelope of the earth
The measuring unit of atmospheric pressure.
bar or millibar
The curved lines that join the points of equal pressure in atmospheric pressure maps.
Isobar
The atmospheric layer at which pilots prefer to fly.
Stratosphere
The density of air on the top of a mountain is.......than the density of air at the sea level.
less
Wind moves from the areas of ......... atmospheric pressure to that of........atmospheric pressure.
high,low
............ is the first layer of atmospheric envelope and its thickness is about.........
Troposphere,13 km
Troposphere contains about ........% from atmospheric envelope mass and about .....% from atmospheric water vapour .
75,99
Stratosphere extends with a thickness equals.........km .
37
In the lower part of stratosphere , .............layer is constant at ........ , then it increases gradually until it reaches ......... at its top .
-60 , 0
