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Also known as catastrophe, calamity, disasters

thumb|right|Ruins from the 1906 San Francisco earthquake, one of the worst disasters in the history of the United States|300x300pxA disaster is an event that causes such serious harm to people, buildings, economies, or the environment that the affected community cannot manage without external assistance or relief. The United Nations Office for Disaster Risk Reduction defines a disaster as "a serious disruption of the functioning of a community or a society at any scale due to hazardous events interacting with conditions of exposure, vulnerability and capacity, leading to one or more of the fol