The ______ lies above the mesopause and is a region in which temperatures increase with height.

🔑Key Points:
-The thermosphere lies above the mesopause and is a region in which temperatures increase with height.

✏️Thermosphere:
-In the thermosphere, the temperature rises very rapidly with increasing height.
-The ionosphere is a part of this layer.
-It extends between 80-400 km. This layer helps in radio transmission.

🔴Additional Information:
-There are a total of five atmospheric layers. These are –
-Troposphere.
-Stratosphere.
-Mesosphere.
-Thermosphere.
-Ionosphere: the lowest part of the Thermosphere contains the ionosphere.
-Exosphere.

✏️Stratosphere:
-It lies beyond the troposphere, up to an altitude of 50 km from the earth's surface.
-The temperature in this layer remains constant for some distance but then rises to reach a level of 0°C at 50 km altitude.
-This rise is due to the presence of ozone.
-This layer is almost free from clouds and associated weather phenomena, making conditions most ideal for flying aeroplanes.

✏️Exosphere:
-This is the uppermost layer of the atmosphere extending beyond the ionosphere above a height of about 400 km.
-The air is extremely rarefied and the temperature gradually increases through the layer.
-Light gases like helium and hydrogen float into space from here.

✏️Troposphere:
-It is the lowermost layer of the atmosphere.
-The layer starts at Earth's surface and extends 8 to 14.5 km high (5 to 9 miles).
-The troposphere contains dust particles and water vapour.
-This is the most important layer of the atmosphere because all kinds of weather changes take place only in this layer.
-The zone dividing troposphere from the stratosphere is known as the tropopause.