1. This layer of atmosphere is closest layer to the earth crust.
a. Troposphere
b. Mesosphere
c. Ionosphere
d. Thermosphere
2. This layer of atmosphere plays the important of radio and telecommunication in earth.
a. lonosphere
b. Troposphere
c. Mesosphere
d. Thermosphere
3. In this layer found the Ozone which protects the Earth from harmful UV Rays.
a. Stratosphere
b. lonosphere
c. Mesosphere
d. Troposphere
4. This is the coldest region of the atmosphere.
a. Mesosphere
b. lonosphere
c. Troposphere
d. Thermosphere
5. The third layer of the Atmosphere. a. Thermosphere
b. Mesosphere
c. Exosphere
d. Troposphere​