Hi!
Basically convection is the transfer of thermal energy through fluids. Examples would be air and water.
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Convection waves are invisible: You can't see them.
A convection cell churning near mid-ocean ridges.
In convection less molecules occupy large volume as in air to reduce the density.
Radiation
Convection waves are a churning upward motion from the up welling of warm liquid or gas, and the concurrent downward flow of cooler material to take its place.