Differential rotation in Earth's mantle

[oriel36]

Here is a guide for observed differential rotation in a rotating
celestial sphere -

http://www.astronomynotes.com/starsun/sun-rotation.gif

Adjusting for viscosity in the plastic-molten mantle ,differential
rotation that straddles the Equator and moves in symmetrical bands
wouldf generate a deviation from a perfect sphere or what amounts to
the same thing - an Equatorial bulge.

As differential rotation bands and deviations from a perfect sphere are
observed in the gas giants of Jupiter and Saturn as with the Sun in
above time lapse footage ,to ignore the mechanism in the plastic-molten
mantle of the Earth is to make our planet an exception.

As differential rotation occurs in a rotating celestial object where a
fluid is involved,even a plastic-molten one,in order for differential
rotation to be proposed as a workable mechanism for the generation and
existence of an Equatorial bulge,the obstacle of 'convection
cells/stationary Earth' concept has to be expunged.

The motion of component plates and the existence of the planet's shape
may be comfortably dealt with using a single mechanism,a mechanism
that is physically observed in other rotating spheres .In that many
people have been accustomed to 'convection cells' as a convenient
guess as to what is driving the plates which sit on top of the molten
mantle,it is hoped that a more suitable dynamics can presented to bring
a more satisfying solution to plate motion and the Earth's shape.