11. The great commotions of the Earth have taken place when the crust, by reason of its thinness, offered only a feeble resistance to the effervescence of the incandescent substances in the interior. They diminished in intensity and generality as the crust consolidated. Numerous volcanoes are now extinguished; others have been recovered with rocks of a posterior formation.
There will still be local perturbations, in consequence of volcanic eruptions; also new volcanoes will open with the sudden inundations of certain countries. Some islands will spring out of the sea, and others will be engulfed by it; but the time of the general inundations, like those which have marked great geological periods is past. The Earth, henceforth, will take a position which, without being absolutely unchangeable, place human beings in shelter from general perturbation unless by unknown causes, strange to our globe, something should happen which cannot be foreseen.