Is the troposphere considered a variable layer?

Although, I am not sure what you mean by whether the troposphere is a variable layer; I will try to answer your question anyway. read more

Atop 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. read more

The troposphere is the lowest layer of Earth's atmosphere, containing about 80% of the total mass of the atmosphere. Most types of clouds are found in the troposphere, and almost all weather occurs within this layer. read more

The troposphere is the lowest portion of Earth's atmosphere, and is also where nearly all weather takes place. It contains approximately 75% of the atmosphere's mass and 99% of the total mass of water vapor and aerosols. read more