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Convection it is........

On Earth, because of air density depending on temperature, the warm air rises and the cold air sinks as warm air is less dense than cold air. That is what scientists call convection.

Convection is one of the processes that allows cloud formation. When the sun shines, the air at the ground level that contain water vapor is heated and it begins to rise, and as the air rises, it begins to cool. Clouds are formed when the humid air is cooled below a critical temperature : the water then condenses on tiny suspended particles and forms droplets in the atmosphere.

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Uploaded on August 26, 2009
Taken on August 21, 2009