How and why does conduction influence the temperature of air above a warm surface? above a cold surface?

This is actually a science question, this is because the air particles with the warmer temperature always go up and air particles with the cooler temperature always goes down, and this process is called convection.
I hope this could help you ;)

Element 17 is chlorine it is a group 7 element(halogen) and belongs to period 3 of the periodic table