Convection is the transfer of thermal energy by means of currents in a fluid (liquid or gases).
Convection current in water
Water at the bottom that is heated expands. Its density decreases and the warm water rises.The cool water at the top being denser moves down and gets heated in turn.
Covection current in air
During day time, lands heats up faster than water. Air above the land heats up and rises, cool air above the sea rushes in.
During night time, lands cools faster than see. Cool air aboce the land moves to the sea, warm air above the sea rises.
Short clip(:
http://www.youtube.com/watch?v=5pG-tkbQgMo
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