Risks caused by natural or manmade disasters, and therefore impossible to reliably predict, are called ____________________.

When the damaging impacts of natural or man-made pressures exceed a certain area's or community's ability to satisfy the demand for health care. It is defined by the World Health Organization as "a sudden ecological occurrence of sufficient size to necessitate external help." Natural disasters and man-made disasters are classified into two categories.

Natural disasters occur when calamities are caused by natural factors over which man has little control. Earthquakes, landslides, floods, droughts, cyclones, and other natural calamities are widespread. Tsunamis, volcanic eruptions, and wildfires are examples of Natural disasters. These calamities result in massive loss of lives and property.

Man-made disasters occur when disasters occur as a result of human carelessness or the mismanagement of harmful technology. Train accidents, airline crashes, building collapses, bridge collapses, mine collapses, tunnel collapses, and so on are common instances of these tragedies.

Floods, tsunamis, earthquakes, and storms are all considered disruption risks.