Magnetic Sphere, Hollow Earth?

JAMES

New member
As I watched my Grandson working to construct a sphere using one half inch sized magnets my mind went to a hollow earth. Could this be a model?
 
No, how the earth is able to generate and maintain a magnetosphere is through the rotation of molten rock about a solid core. It is closer to a dynamo than anything else.http://science.nasa.gov/science-news/science-at-nasa/2003/29dec_magneticfield/http://www.es.ucsc.edu/~glatz/geodynamo.html