Go to someplace where a highway has been cut through the rock. At the bottom of the cut there is stone there with tons of stone above it withstanding all this pressure you want me to envision. You will be standing on neighboring rock that used to be under the same pressure before the cut was made. Maybe you can find a small piece to take home or maybe you will have to use a tool to chip a small piece you can carry. Bring it home and put it a vise. Once you subject the rock to real pressure it will almost certainly fracture, but it had previously survived all that pressure you talk about. Solids are not fluids.
I don't pretend to understand this particularly well but I don't think anyone does. In your little mind experiment where you have me add all the forces of all those 2.2 kg blocks down to the center of mass, you conveniently (for your view) have me stop right there. But why shouldn't I just keep on going and start accumulating all those equal and opposite force vectors once I pass through the center?
ML/NJ
If we had a hollow earth then your cave analogy would be correct.
At the bottom of the road cut the stone is indeed withstanding the pressure of the rock above it. Why do you think they brace mine tunnels?
In my mind experiment I did not stop with the initial colunm summation.
“Repeat this in all directions and convert that force to pressure and that is the pressure at the center of mass. Certainly much more than zero.”
Start at the antipode of the point I began the first summation. Repeat the process. You have the same force bearing down from that direction too.