<P> Convection is the heat transfer due to bulk movement of molecules within fluids such as gases and liquids, including molten rock (rheid). Convection takes place through advection, diffusion or both . </P> <P> Convection cannot take place in most solids because neither bulk current flows nor significant diffusion of matter can take place . Diffusion of heat takes place in rigid solids, but that is called heat conduction . Convection, however, can take place in soft solids or mixtures where solid particles can move past each other . </P>

What two types of materials will convection most likely occur
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