1. Natural hazards are events that are caused by natural processes, such as earthquakes, hurricanes, and floods. 2. Technological hazards are events that are caused by human activities, such as industrial accidents, transportation accidents, and hazardous materials spills. 3. Biological hazards are events that are caused by living organisms, such as disease outbreaks, animal attacks, and insect infestations. 4. Socioeconomic hazards are events that are caused by social or economic factors, such as poverty, unemployment, and crime.