Help on Temperature and Pressure for a Model for examining gravity from the surface of the Earth to the center.

It is called MODELBS which stands for Model Below Surface or modelling gravity, temperature and pressure in the various layers of the Earth.
The model is still a bit raw and can be improved.

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This modelling program will attempt to examine the way Newton forces act on a small standard 1kg object and the changes as the small object is taken at intervals toward the center of a large object.
It uses gravity as the main force and includes Mass in Front and Mass Behind.
It takes into account the density of the various layers of the Earth.
An assumption was that gravity at the center is zero due to an object being pulled equally in all directions and this is a basis to prove the model.
The properties of Earth - such as Radius, Average Density, Layers, Density and Temperature are taken as constants based on the best found knowledge from other sources.

The following diagram shows one position of the Small Object (SO) as it is taken conceptually from the surface to the center. In the model, it is called a slice. The Small Object is between two Sperical Caps. The smaller is Mass Behind and the Larger is Mass in Front. The net gravity force is towards the center.

The following diagram shows the layers of the Earth.

It shows some net force lines - Gipa and TiPa. GiPa is Gravity induced Pressure and TiPa is Temperature induced Pressure.

Temperature seems easier than pressure. Temperature is taken as constants from other sources. Temperature travels through solid objects and wants to seek equilibrium, so a high Temperature at the center is accepted. Temperature wants to exert forces to expand matter. We see the result of Temperature induced Pressure when a fissure occurs in the crust and we get a volcano. It becomes a net force that is greater the the net force of gravity.

However, Pressure seems to be a problem. The model just takes mass above and results in extraordinarily high pressures which seem too unreasonable. So here is a brief explanation as to why pressure in the model is a problem.

Take the concept of a pipe sealed at the ends. The solid ring of the pipe is made of metal. You can apply high pressure outside the pipe but the interior of the pipe has negligible pressure from the outside.

The Inner Core are solid. So they are like the pipe idea. The pipe is a really spherical ring like a table tennis ball.

The Inner Core of the Earth is solid and should protect pressure from above being transmitted to the Very-Inner center of the Earth. It could even be that the Mantle and Outer Core which seem to be semi-liquid could protect pressure from above reaching the inner sections.

It just seems that Very-Inner center of the Earth could have low gravity forces and lower pressure but high temperature. It seems too hard to prove this in the model and I hope someone can come after me to improve the model.

Footnote: We are told that solids do not compress much. So densities of 13,000 kg/m^3 are not explained by rocks compressing. It could be explained by a concentration of heavier elements such as gold and lead.