Excluding the exosphere, the atmosphere has four primary layers, which are the troposphere, stratosphere,
mesosphere, and Thermosphere.
The atmosphere is generally divided into four horizontal layers( on the basis of temperature): the troposphere( the first 12 kms from the earth in which the weather phenomenon occurs), the stratosphere,( 12- 50 kms, the zone where 95 per cent of the world' s atmospheric ozone is found), the mesosphere( 50-
80 kms), and the Thermosphere above 80 kms.