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Troposphere is thickest at
Poles
Equator
Sub-tropics
Temperate regions
The troposphere is thicker at the equator than at the poles because the equator is warmer. The convection currents of air expand the thickness of the troposphere (atmosphere) at poles. Thus the simple reason is thermal expansion of the atmosphere at the equator and thermal contraction near the poles. Also, the rotation of the earth causes centrifugal force which is strongest near the equator and pushes the atmosphere to greater heights. The thickness of the troposphere also varies with season. The troposphere is thicker in the summer and thinner in the winter all around the planet. At the poles in winter, the atmosphere is uniformly very cold and the troposphere cannot be distinguished from other layers.
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