chapter 1 Thermal interaction of the core and mantle / chapter 2 Convection and the lower mantle / chapter 3 Electromagnetic and topographic coupling, and LOD variations / chapter 4 Geomagnetic reversals -- chapter 5 Energy fluxes and ohmic dissipation in the earth's core -- chapter 6 Convection in rotating spherical shells and its dynamo action / chapter 7 Dynamo and convection experiments / chapter 8 Dynamics of the core at short periods.