The curved lines that join the points of equal pressure in atmospheric pressure maps.

The gaseous envelope which surrounds the earth and its rotating with it around its axis .

The density of air on the top of a mountain is.......than the density of air at the sea level.

Wind moves from the areas of ......... atmospheric pressure to that of........atmospheric pressure.

The measuring unit of atmospheric pressure.

The atmospheric layer at which pilots prefer to fly.

............ is the first layer of atmospheric envelope and its thickness is about.........

Troposphere contains about ........% from atmospheric envelope mass and about .....% from atmospheric water vapour .

In the lower part of stratosphere , .............layer is constant at ........ , then it increases gradually until it reaches ......... at its top .

Stratosphere extends with a thickness equals.........km .