History is unfortunately full of episodes in which natural catastrophes have claimed a very high number of victims.
Looking at the case history, among the main causes that have triggered natural disasters throughout history are earthquakes, followed by floods and cyclones. These are natural phenomena beyond the control of man, who often manages to do very little, even in terms of prevention, against them.
The downside of all this is, of course, the high number of victims and the destruction that such phenomena generally entail. Often, in both cases, with devastating effects of great magnitude. (source: livescience)