The layer where the decrease in temperature with increasing altitude is totally absent in
a) Troposphere
b) Ionosphere
c) Stratosphere
d) Mesosphere
Answer. c) Stratosphere
Earth's atmosphere has five layers, the names of the five layers starting from Earth's surface are as follows:
- Troposphere
- Stratosphere
- Mesosphere
- Thermosphere ( Ionosphere)
- Exosphere
Troposphere:
In the troposphere, for every one-kilometer of increasing altitude, there is a decrease in temperature by 6.4 degrees centigrade. It happens up to the tropopause.
All the weather phenomena like clouds and rainfall happen in the troposphere.
The average height of the Troposphere is about 11 to 13 km above sea level.
Hot air balloons fly in the troposphere.
Stratosphere:
The stratosphere is the layer where the decrease in temperature with increasing altitude is absent.
Temperature rises as one moves upward through the stratosphere
Weather phenomena are nearly absent in the stratosphere which is why commercial jet aircraft fly in the lower stratosphere to avoid the turbulence which is common in the troposphere.
The ozone layer is in the stratosphere. It prevents us from UV (ultraviolet) rays. Dobson unit is used for the measurement of the thickness of the Ozone layer. Montreal Protocol ( 1987) is for the protection of the Ozone layer.
Mesosphere:
The mesosphere is the coldest layer of the atmosphere where most meteoroids burn.
Thermosphere ( Ionosphere):
The thermosphere or Ionosphere is the hottest layer of our atmosphere.
Radio wave reflects to earth from the Ionosphere and it helps in radio communication.
Exosphere:
The exosphere is the outer layer of our atmosphere.
Aurora and satellites are found in the exosphere.
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