A disaster is a disaster that causes damage to life and property, affect the economy and people's life in society, both in the short and long term disaster, is divided into two categories: natural disasters and man-made disasters.
Natural disasters are caused by natural disasters such as earthquakes, storms, floods fire bombs by this blast is an explosion of high light sensitivity with kaes nature released to the outside. In addition, natural disasters also includes hazard from outside world, such as meteors.
Man-made disaster is a disaster that is caused by humans, such as underground water pumping has resulted in excessive quantity of ground. Large amounts of greenhouse gas emissions from industrial plants, until as a result, sea level rise and flood areas in the lower level. Changing the water until it caused drought in some areas, etc., as well as scientific experiments, such as a nuclear bomb underground experiments that affect the stones beneath the crust. It may have impact on the world in the long run, etc.