On the basis of origin, natural disasters have been classified into three parts:
1. Seasonal disasters.
2. Topographic disasters.
3. Biogenic disasters.
1. Seasonal disasters: The disasters which evolve due to change in seasons are known as seasonal disasters. Cyclones, excess rainfall, flood, drought, snowfall are included in seasonal disasters.
2. Topographic disasters: These are disasters that occur due to a sudden change in the form of earth’s surface. Landslides, snow slides, earthquakes and volcanoes are included in topographic disasters.
3. Biogenic disasters: In this category, those disasters are included that occur due to living beings. Epidemics, loctust attack, plague, malaria, etc. are the examples of biogenic disasters.