Natural calamities are the calamities which are inflicted by God, or Nature, or man and his world. At these calamities, the unseen hand wreaks havoc in the part of the world it chooses to act upon. On these natural activities of nature no scientific or technological developments can wield any control.

They can occur as and when and where ordains it. Natural calamities can be of many different kinds, but the similarly in all, is their massive destruction in the area of their occurrence. The natural disasters are of many kinds, they are drought and famine, flood, earthquake, hailstrom and a cyclone.

In the wake of all these, in one sweep there is complete devastation and destruction, due to which normal life comes to a standstill. Loss of life is well nigh complete, and belongings of people get lost, blown away or swept away. The scene is one of the awe, of some unknown power that appears to wreak some revenge on the people of the area.

One feels that, there will never again be life in the area, there will never again come up any construction in the area. But, nature plays its part in this also, and even after the most ghastly disaster, life has come up blooming as ever as before in areas of such devastation.