Correct Answer - Option 3 : Troposphere and Troposphere
Concept:
The lowest region of the atmosphere bounded by the earth in which human being live and clouds form is known as troposphere. It extends up to a height of 10 to 13 km from sea level.
Clouds form in different ways. Some clouds form as air warms up near the Earth's surface and rises into the troposphere.
The troposphere is the lowest layer of Earth's atmosphere, and also nearly all weather conditions take place. It contains approximately 75% of the atmosphere mass and 99% of the total mass of water vapor and aerosols.
The average height of the troposphere is 18 km, but in the tropics 17 km in the middle latitudes, and 6 km in the Polar Regions in winter. The total average height of the troposphere is 13 km.
In the lowest part of the troposphere, where friction with the Earth's surface influences air flow, is the planetary boundary layer. This layer is typically a few hundred meters to 2 km deep depending on the landform.
A top of the troposphere is the tropopause, which is the border between the troposphere and stratosphere. The tropopause is an inversion layer, where the air temperature ceases to decrease with height and remains constant through its thickness. Thus, clouds are not formed in stratosphere.
