Transfer of heat from1 body 2 another is convection & the cooler heaviear air which move down & take the place of the warmer air ,thus setting up CONVECTION CURRENT                                                                                                             convection current in nature : sea breeze & land breeze 
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Convection current refers to the air current which prevails in the atmosphere.
When cold winds are heavier & hot winds are lighter.
When the hot wind rises & the cold winds decent down this continuous process sets up a convection which is known as the convection current.