Question

Which is the coldest atmospheric layer?
1. Troposphere
2. Ionosphere
3. Exosphere
4. Mesosphere

Answer 1

Correct Answer - Option 4 : Mesosphere

The correct answer is Mesosphere.

• The mesosphere is the coldest atmospheric layer.
• The Mesosphere is located between 50 and 80  kilometers (approx.) above Earth's surface.
• The average temperature of the mesosphere is about minus 85 degrees Celsius.

• The thermosphere is the hottest atmospheric layer.
• The troposphere is the lowest layer of Earth's atmosphere.
• The ionosphere is a very active part of the atmosphere, and it grows and shrinks depending on the energy it absorbs from the Sun. 
• The column of the atmosphere is divided into five different layers depending upon the temperature condition.
• They are the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.
• The troposphere is the lowermost layer of the atmosphere. Its average height is 13 km and extends roughly to a height of 8 km near the poles and about 18 km at the equator.
• The zone separating the troposphere from the stratosphere is known as the tropopause.
• The stratosphere is found above the tropopause and extends up to a height of 50 km.
• It contains the ozone layer. 
• The ionosphere is located between 80 and 400 km above the mesopause.
• This is the highest layer but very little is known about it.