Geog

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Submitted By 214545832
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In primary School, we would define the atmosphere as a“ blanket covering the Earth” but in general it is defined as a layer of gases that surrounds the earth , I like to define it as the source of life ,that is to say there would not be life without the atmosphere . The atmosphere insulates the Earth from extreme temperatures; it keeps heat inside the atmosphere and it also blocks the Earth from much of the Sun's incoming ultraviolet radiation (NASA 1999).
The Earth’s atmosphere is divided into four different layers , namely , the Troposphere , Stratosphere , Mesosphere and the Thermosphere, In this essay , I am going to explain , with the aid of a diagram the layered structure of the atmosphere, the different temperatures that occur and also the different processes that take place in all the layers.

layered structure of atmosphere
As you can see in this picture above, this is how the layers are positioned in the atmosphere, it starts with the Troposphere which is the bottom layer and the one closest to the Earth ,it is the most important layer because all life takes place here, the important gases which are essential for living are found only here , it has a height of 12km, almost all weather occurs in this layer, the air is warmer at bottom of the troposphere and as you go up it gets cooler until eventually it reaches a point of dryness because altitude varies with latitude All the different layers have boundaries that separate them, in the troposphere it is called the tropopause ,the tropopauses separates the troposphere from the stratosphere which is the layer above and it is where the temperature declines , this rate of decline is known the lapse rate. The tropopause is not a complete barrier, it leaks. Strongly convective tropospheric storms transport water vapour up across the tropopause. There are breaks in the tropopause near jet stream westerlies…...

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