Jules Verne,
Journey into the Interior of the Earth…
(1877)
“ Why should it not, at a certain depth, attain an impassable limit, instead of rising to such a point as to fuse the most infusible metals?" As my uncle was now taking his stand upon hypotheses, of course, there was nothing to be said. "Well, I will tell you that true savants, amongst them Poisson, have demonstrated that if a heat of 360,000 degrees [1] existed in the interior of the globe, the fiery gases arising from the fused matter would acquire an elastic force which the crust of the earth would be unable to resist, and that it would explode like the plates of a bursting boiler." ”
