E,

Only the INNER core is solid, the outer core is liquid. The rocks in the mantle are solid for our purposes.

For density structure, type PREM into Google, as I just posted, its a model from 1981 paper, Anderson and Dziewonski, PEPI.

And you've ignored the oceans sloshing around again, often the largest factor in tidal stresses. The Earth is not being twirled by a string, it is connected by gravity.

No visible "clear demonstration", nor who's in the effort you're leading, nor who in international government is reading your email.

J