Question

on what basis are the layer of atmosphere seperated

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Answer 1

Explanation:

When air expands it cools. So air higher up is cooler than air lower down. The lowest part of the troposphere is called the boundary layer. This is where the air motion is determined by the properties of the Earth's surface.

Answer 2

The atmosphere can be divided into layers based on its temperature, as shown in the figure below. These layers are the troposphere, the stratosphere, the mesosphere and the thermosphere. A further region, beginning about 500 km above the Earth's surface, is called the exosphere.