Question

5. Why and how does atmosphere exist in layers ?
​

Answer 1

Explanation:

The different layers of the atmosphere. 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.

Answer 2

Layers of the Atmosphere

Troposphere. The layer of the atmosphere closest to the Earth is the troposphere.  

Stratosphere. Above the troposphere is the stratosphere, which extends to about 31 miles (50 km)

Mesosphere. From about 31 to 53 miles (50 to 85 km) above the surface of the Earth

Thermosphere. The thermosphere rises several hundred miles above the Earth's surface