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Structural and dynamical guidelines for discussion
Regardless of the nature of a celestial object,be it a star,planet or
moon, the densest material exists at the core and becomes less dense the further it exists from the core,sometimes going through a transition of states such as the transition zone between the ocean/ atmosphere and the rotating molten interior,this zone is made up by the Earth's fractured crust ( less dense than the interior/denser than the liquid oceans and atmosphere.There may be some objections to the oceans considered as seperate from the crust amnd allied with the atmosphere in terms of being a planetary layer but that is left open for discussion. Stars of a given size and composition will often vary in shape depending on maximum Equatorial speed - http://www.youtube.com/watch?v=iwCpcoS0jKc The binding correlations follow three prime components- composition,maximum equatorial speed and differential rotation,for example,a variation in equatorial speed effects shape which in turn affects differential rotation. of the rotating composition As our planet is not a perfect sphere and there is a very good indication that rotational geodynamics is involved in crustal geodynamics,there is a good opportunity to draw on the lessons and observations of stellar rotational dynamics and apply them to the Earth.The neatest feature is that the differential rotational shear bands provide a better mechanism for crustal motion that geostationary 'convection cells'. The point of discussion here is whether rotational geodynamics is more productive than geostationary 'convection cells'. Plate tectonics appears to have stalled as an excellent concept due to the weakness of the underlying mechanism of convection cells,a concept that does not require any reference to a rotating Earth or its oblate shape.Plate tectonics looks far better from a rotational geodynamical standpoint by virtue of linking planetary shape and crustal dynamics under a common rotational mechanism.The real discussion is how to organise the interior composition to satisfy the 40 km deviation with the energy rquired to move the surface crust.In terms of a bowling ball,the surface crust would only account for a millimetre of so compared to the diameter of the ball so it is no stretch to consider that the 40 km deviation has a far more powerful rotational mechanism than that needed for plate tectonics. .. Forging closer links between astronomical dynamics and geological evolution is not such a huge leap,most people already know that rotational dynamics alters the profile of the planet and the fractured crust moves along this less than spherical profile.I can put it down to something that has yet to occur to people in applying genralised rotational principles to a celestial object in a flexible/molten state.It is also highly enjoyable to cross over between astronomy and geology. |
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