Question

Select the option that has the various layers of the atmosphere in the correct sequence from the surface of Earth to outer space.

• A. Mesosphere $\to$ Stratosphere $\to$ Exosphere $\to$ Thermosphere $\to$ Troposphere
• B. Troposphere $\to$ Stratosphere $\to$ Mesosphere $\to$ Thermosphere $\to$ Exosphere
• C. Stratosphere $\to$ Mesosphere $\to$ Thermosphere $\to$ Troposphere $\to$Exosphere
• D. Troposphere $\to$ Stratosphere $\to$ Thermosphere $\to$ Mesosphere $\to$ Exosphere

Answer 1

The correct option is B Troposphere $\to$ Stratosphere $\to$ Mesosphere $\to$ Thermosphere $\to$ Exosphere

Atmosphere includes various layers of gases surrounding the Earth. It is composed of about 78% nitrogen, 21% oxygen, and 1% other gases. It provides oxygen to the living organisms. It protects the Earth from harmful ultraviolet solar radiation. It creates the pressure required and it warms the planet and keeps temperatures required for maintaining life on Earth.

The atmosphere can be divided into five layers. These layers are as follows:

• Troposphere - It is the lowest layer of the atmosphere where life sustains. It contains most of the clouds, rain and snow.
• Stratosphere - This is the second layer which extends upwards from the troposphere to about 50 km. It contains good ozone which acts as a shield and blocks the entry of harmful UV radiation from the sun. The temperature increases with height in this layer because of absorption of ultraviolet (UV) radiation from the sun by ozone.
• Mesosphere - It is the third layer present above the stratosphere.
• Thermosphere - It is the fourth region that lies above the mesosphere.
• Exosphere - It is the fifth layer present above the thermosphere.