The layer of atmosphere having lowest temperature is

In the vertical structure of the atmosphere, which one is the lowest layer?

Which layer of Atmosphere is used for Telecommunication?

Which one of the following layers of the atmosphere is responsible for the deflection of radio waves?

Ozone layer, which absorbs the ultra-violet radiation, is found in which one of the following layers of the atmosphere?

The Earth's atmosphere is mainly heated by which one of the following?