"Yet it is evident that the surface of the globe has been subject to the action of fire," I replied, "and it is quite reasonable to suppose that the external crust cooled down first, whilst the heat took refuge down to the centre."
—Sin embargo, es evidente que la superficie del globo ha sufrido una combustión, y cabe, por lo tanto, suponer que la corteza exterior se ha ido enfriando, refugiándose el calor en el centro de la tierra.