Why does the troposphere vary in thickness? Air turbulence in the troposphere varies the altitude.
Warmer air dissipates into the stratosphere. Cooler air is trapped in the troposphere.
Cooler air contracts lowering the height, warmer air expands raising the altitude.
Water vapor weighs down troposphere and less water vapor cause it to rise higher

Explanation:

The other attribute to thicker troposphere is the temperature which is the lowest at poles (being the farthest from the Sun) and the highest at the equator. Since colder air is denser and takes up less space, the troposphere appears shrunk at the poles or bulged at the equator.

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sunlight and water

explanation: