Hasn't the geological perspective of the educated populace changed? Many of us have been exposed through various media to the 'plate tectonics' explanation of earthquakes; therefore, digging through the Earth to China no longer seems as feasible as it did to the cartoonists' following of sixty or so years ago. The idea of a superhot asthenosphere, on which those tectonic plates float, seems rather widely accepted now; ...at least by the "secular humanists".
http://www.geology.sdsu.edu/how_volcanoes_work/Heat.html
http://www.windows.ucar.edu/tour/link=/earth/interior/earths_crust.html&edu=high
http://en.wikipedia.org/wiki/Asthenosphere
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