Natural Disaster
A natural disaster is a major adverse event resulting from natural processes of the Earth; examples include floods, hurricanes, tornadoes, volcanic eruptions, earthquakes, tsunamis, and other geologic processes.
Man-made
Man-made disasters are usually the result of things going wrong in our complex technological society. They include blackouts, hazardous material spills, air pollution, house fires, radiation leaks, food or water contamination, and industrial chemical releases.
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