The given point is the separation between hot and cold current as a result of difference in air pressure.
What is a convection current?
A convection current is a type of heat transfer that occurs from the movement of hot air and cold air due to difference in air pressure.
Upward arrow
The upward arrow shows hot air rising up due to its low density.
Downward arrow
The downward arrow shows cold moving downwards to replace the risen hot air due to its high density.
Thus, the difference in air pressure between the hot air and cold air is causes convection current.
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