The natural disaster is the worst thing we human can encounter since we can't control or stop over it. The worst I have ever seen was the floods and tsunami, water is very dangerous thing have ever seen. Especially the one happened in Japan, the tsunami in HawaIi and the flood over in Luzon Philippines. Lot of people died in it and some were not found at all. The nature itself react to what human did,a nd it just take many lives of innocent people. Flooding should be preventable if we don't cut trees, if we don't throw garbage everywhere that can cause the drainage blocked. The landslide also is unpredictable, typhoon is worst disaster, and also the earthquake. After huge earthquake is a big tsunami as they said, and that is dangerous if you don't follow evacuation plan. I remember also the mountain eruption, but this is predictable and people near area must evacuate as soon as possible.