Why is the troposphere thicker in the equator than in the poles?

Question

my teacher said there are two reasons,
i guess the first one is because of the temperature, what is the other one?

Answer 1

Centrifugal force . Because the speed of the rotating earth is greatest at the equator the atmosphere tends to bulge out due to friction and coriolis force.

Answer 2

The second one is gravity.Gravity value increases from equator to poles as the earth is not a perfect sphere.That means the gravitational force is more over poles.Hence the atmosphere is pulled with more force near the poles and leads to contraction of the atmosphere.As you mentioned, the surface temperature at the equator is always more than that of the poles.The top of the trposphere is at a temperature of -80 (minus eighty) degrees approximately with slight variation over the equator and poles .To attain this temperature from the comparatively high surface temperature near the equator,more vertical height is required.These two are may be the reasons.This is my guess only.

Answer 3

more sunlight is apparent in the equator , and remember the globe? it's like the real earth, we can see that the equator is always the one that's going to be hit by sunlight because it is closer