I am not entirely sure that the fundamentals are correct but I think they might be. Will ask around and test best I can whether this is how magnets would behave, if it is, it could be a valid theory for what causes the Earth to increase in radius, and also why the mass of the Earth is accumulated in a shell.
I have written a book about the hollow earth theory that is consistent with Newtonian physics if you want to check it out.
I have read what I could find on this subject
Pleiadian perspectives on human evolution by Amorah Quan Yin.
Ets and Aliens Who are they ? & Why are they here ? by Noel Huntley
Hidden Mysteries by Joshua David Stone
Messages from Hollow Earth by Dianne Robbins.
All of the above books can be found on Amazon as well as https://Libgen.is
I recently wrote this, check it out if you'd like.
i'll put the link
it's a book that made the most sense about the hollow earth
A century or two from now, big bang, black hole, dark energy, dark matter, relativity, solid planet, redshift and expanding universe, gravity dominated universe, etc. theories will be treated as conspiracy theories. Mainstream media of future will look back to our time and treat academics who believed all the current mainstream theories just like how mainstream media of today looks back to 300 years ago and treats people who believed flat earth or geocentric solar system. This will be an era where Electric Universe/Plasma Cosmology has become mainstream science and an era where civilian space travel to other planets has become a norm and humans have lot more freedom to travel across every parts of earth and other planets in their anti-gravity flying machines.
Research Electric Universe/Plasma Cosmology:
https://www.youtube.com/playlist?list=PLwOAYhBuU3Uez8f1P6ZyYdI90Egln3rX5
https://www.amazon.com/Physics-Plasma-Universe-Anthony-Peratt/dp/1461478189
You are coming from gravity can do anything point of view which is the old and expired view. Research Electric/Plasma Universe model and read those mentioned scientific books on hollow earth. Everything changes once you get familiar with Electric/Plasma Universe model. You no longer need molten core as magnetic field can be easily generated by plasma core or the metallic shell itself or even externally by birkeland currents. Gravity of planet can change depending on its electric charge, density doesn't matter as much anymore. And so on.
The universe is fundamentally electromagnetic, not gravitic. And every event in space is electromagnetic and plasma events in plasma filled space. No need for mainstream conspiracy theories like dark matter, dark energy, big bang, back hole, etc. anymore.
Physics of the Plasma Universe, read that book: https://www.amazon.com/Physics-Plasma-Universe-Anthony-Peratt/dp/1461478189
It is available in amazon as an e-book. https://www.amazon.co.uk/Earth-Really-Solid-Evidence-Reexamined-ebook/dp/B07W89TJG4/ref=sr_1_1?keywords=oliver+milatovic&qid=1566117331&s=books&sr=1-1
The paperback version is on its way