Geodynamics and crustal geodynamics

This is the best contemporary guys can do with the cause of the
spherical deviation,in case anyone believes otherwise,it is extremely
poor to the point of being childish -

http://www.iki.rssi.ru/mirrors/stern.../Srotfram1.htm

The actual mechanism is in observed fluid dynamics of differential
rotation,the generalised principles borrowed from stellar rotational
dynamics.

The difficulties arise in that the contemporary direction is to
organise the Earth's interior to suit a stationary Earth notion of
'convection cells' whereas rotational geodynamics requires a different
set of criteria organised around the 40 KM deviation from a perfect
sphere and the dynamics to move the fairly thin crust.In short,little
is known about the viscosity and composition of the interior but with
clues like the spherical deviation,the mid-Atlantic ridge and the
direction of crustal evolution,there is a tendency to apply
generalised principles for rotating bodies to the Earth's interior.