Astronomy and geology

If circumstances were normal there would be no issue in drawing from observations of rotating celestial objects with exposed fluid compositions and applying the lessons to the Earth. Our sister planet Venus provides an additional benchmark for extrapolating evolutionary geology/ planetary spherical deviation from the dynamic behavior of the planet and its high incidence of volcanic activity as opposed to the Earth with its combination of plate tectonics and volcanic activity.

It is no surprise that those researching the link between the planet's rotation and plate tectonics managed to exempt the Earth from the universal property of differential rotation of the fluid medium beneath the crust but is was always present in this newsgroup for over a dozen years.

How was the link between planetary shape and evolution geology via a common rotational mechanism received ? - as though it doesn't exist.

On Friday, January 5, 2018 at 7:25:49 AM UTC-7, Gerald Kelleher wrote:

It is no surprise that those researching the link between the planet's rotation
and plate tectonics managed to exempt the Earth from the universal property of
differential rotation of the fluid medium beneath the crust

Unlike the atmosphere of Jupiter, or the gases of which the Sun is composed, the
magma of the Earth's mantle has a rather more generous quantity of another
"universal property", something known as _viscosity_.

The behavior of planetary atmospheres and interiors doesn't derive from analogy
- it derives from physical laws working out in the circumstances that exist on
each body.

John Savard