causes of disaster
Natural disasters fall into three broad groups: 1. Those caused by movements of the Earth. These occur with the minimum amount of warning and include earthquakes, volcanic eruptions and tsunamis. They are difficult to predict and impossible to stop.
These are normally quickly dispersed by the wind, but can collect in hollows. High concentrations can cause suffocation. This is the most common cause of death following a volcanic eruption. Tropical cyclones have been the cause of a number of natural disasters. They are storms with large low-pressure centres and numerous thunderstorms that produce high winds and heavy rain. Generally they are known as hurricanes, but in the northwest pacific region they are known as typhoons.