Time evolution of select key core and mantle variables for a sample Type II evolution (blue), a sample Type III evolution (red) and a sample evolution that is both Type II and Type III (purple). The top-left panel plots the upper mantle viscosity over time; the bottom-left panel plots the eruption rate over time; the top-right panel plots the fraction of the core that’s frozen over time; the bottom-right panel plots the magnetic moment over time. The parameter values for each of these sample evolutions are given in Table 10.