Question

how the southern and northern air moves

Answer 1

The air cools as it rises and movesalong the top of the troposphere. ... Back on the ground, the air then travels toward the low pressure at the equator. The air rising at the low pressure zone at the equator and sinking at a high pressure in the direction of the North or SouthPole creates a convection 
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Answer 2

that moves south and north because the pressure of air winds are winds moving the southern part is very good so the air pressure is more