All the physical changes will cause a fear to fall on all men who will no long attribute the changes to natural law, but will see the 'hand of the Almighty' in it.
To them the "Day of Judgment" will become a reality and in fear and terror they will hide themselves in the dens and rocks of the mountains saying, "Fall on us and hide us from the face of Him that sits on the throne, and from the wrath of the Lamb, for the Great Day of His wrath is come, and who shall be able to stand?"