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What is a natural disaster?  What are the five categories of a natural disaster?
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Introduction to Security: Operations and Management
Edition: 5th
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A natural disaster is defined as "a situation or event caused by nature, which overwhelms local capacity, necessitating a request to a national or international level for external assistance; an unforeseen and often sudden event that causes great damage, destruction and human suffering." These hazards exist in the natural environment and they pose a threat toward humans in some manner. The Centre for Research on the Epidemiology of Disasters (CRED) classifies natural disasters into five main categories: (1) geophysical events that include earthquakes and volcanoes; (2) meteorological storms; (3) hydrologic or water disasters including floods; (4) climatological events cases by extreme changes in the weather that result in drought, extreme temperatures, and wildfires; and (5) biological events that can include epidemics and insect and animal infestations.
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