The definition and specification of a convective system is outlined. For example for a global system we have: very small Reynolds number (slow ‘viscous’ flow); very large Prandtl number (heat transfer independent of inertial effects); large Peclet numbers (advection dominant in forced convection); very large Rayleigh number (free convection strong and turbulent).

The very wide range and type of convective systems is briefly described. These include systems ranging from the macro-geological scale to small-scale systems such as found in multilayered intrusions.

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