The earth is covered in a blanket of air called the atmosphere. This is held in place by gravity,and is kept swirling around by heat that earth receives from sun . The atmosphere is divided into layers according to temperature.
Thermosphere- Contains gases which absorbs some of Sun's harmful radiation. This heats up to
1500 c at its upper limit (about 450 km). Above that is a layer containing few gases which merges into space at about 1000 km.
Mesosphere- Contains few gases and is completely dry. It makes it very cold.
Stratosphere- Contains layers of Ozone gas which absorbs most of the Sun's harmful rays.
Troposphere- This is where earths all weathers occur.
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