I must have missed the crutial part of this! Why are we in a struggle
with theories of a hollow earth? Is it supposed to make geomagnetism
easier to understand? What might it do for our theories if we
postulated a hollow earth? It seems to me that the mass comes out
pretty well if you assume that the earth is solid throughout with
something that has a density about the same as that of iron ore. Is
there any observational information that can be more easily explained
with a "hollow" earth? Unfortunately, geophysics is not my forte!
W. B. Newbolt