The word disaster means great damage.It is an unforeseen occurrence that will affect the environment and the organisms in it. The aftermath of natural disasters is mostly worse, though it depends on the severity of it. There are three levels of natural disasters that categorize their severity caused by them.Natural Disasters are of many types, including tsunamis, earthquakes, Avalanches, Hurricanes, Volcanic Eruptions etc.When the rigour force rages on mankind, it is known as a natural disaster.