Far from the ridge, \b[$T(z,\infty)=T_0+\Delta T(1-z/a)$]. Transients have decayed and the <heat equation> reduces to $T_{zz}=0$. A finite basal <heat> supply sustains this <gradient>. Thermal thickness, seafloor depth and surface <heat> flux therefore approach finite limits rather than continuing the laws of the <half-space cooling model> indefinitely.

Solution

Past exam of the physics of the Earth as a Planet course of the University of Cambridge / 2013 / Paper 1 / 1 / a / iv / Solution

 Solution (source code)