This document discusses the classification of hazards and disasters. It identifies three main categories of hazards: natural hazards caused by atmospheric, geological, hydrological, extraterrestrial, or biological processes; anthropogenic non-intentional hazards caused by technological systems, hazardous materials, industrial accidents, or transportation incidents; and anthropogenic intentional hazards including mass shootings, civil disobedience, terrorism, or weapons of mass destruction. Specific examples of natural hazards that commonly occur include volcanic eruptions, earthquakes, thunderstorms, hurricanes, tornadoes, wildfires and floods.