Question

The ______ layer is the upper limit of our atmosphere. It extends from the top of the thermosphere up to 10,000 km (6,200 miles).
1. Ionosphere
2. Mesosphere
3. Troposphere
4. Exosphere

Answer 1

Correct Answer - Option 4 : Exosphere

The Correct Answer is Exosphere.

 

• The uppermost layer of the atmosphere above the thermosphere is known as the exosphere.
• This is the highest layer but very little is known about it.
• Whatever contents are there, these are extremely rarefied in this layer, and it gradually merges with the outer space. 

 

• The atmosphere consists of different layers with varying densities and temperatures.
• Density is highest near the surface of the earth and decreases with increasing altitude.
• 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.

 

• Troposphere
  • 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.
• Stratosphere 
  • The stratosphere is found above the tropopause and extends up to a height of 50 km.
  • The stratosphere contains the ozone layer.
• Mesosphere
  • The mesosphere lies above the stratosphere, which extends up to a height of 80 km.
  • In this layer, the temperature starts decreasing with the increase in altitude.
• Ionosphere
  • The ionosphere is located between 80 and 400 km above the mesopause.
  • It contains electrically charged particles known as ions, and hence, it is known as the ionosphere.