1. A hazard becomes disaster when it affects human population, settlement and their activities.
2. When natural events like volcanic eruptions occur in areas inhabited by humans and cause damage, they are termed as disasters.
3. Disaster causes widespread loss of life and property.
Generally man-made disasters can be prevented as they happen due to mistakes or carelessness by humans. Disasters can be classified into various types depending on their origin as per following:
1. Tectonic Disasters : Earthquakes, Volcanic eruptions, Tsunamis.
2. Geological Disasters : Landslides, Mudslides, Avalanches, etc.
3. Meteorological Disasters : Floods, Cyclones, Storms, Heat Waves, etc.
4. Biological Disasters : Locust attacks, Pest attacks, Epidemics, etc.
5. Anthropogenic or Man-made Disasters: Industrial accidents, Transportation accidents, Nuclear accidents, etc.
