There have been many volcanic eruptions in the history of our planet that had devastating effects. Sometimes the whole civilization got destroyed because of this. There are primarily three kinds of volcanoes named dead, dormant and active. The active volcanoes erupt often. The dead or extinct volcanoes are those that have no magma supply and hence are declared by scientists as unlikely to erupt again. But the dormant volcanoes are the one that might remain extinct for a long period of time and then suddenly erupt one day killing millions.
The volcanic eruptions in the countries of Iceland, Indonesia, West Indies have shown us that how devastating the volcanic eruptions can be, this is one of the natural disasters that gives people very little chance to escape. Some volcanic eruptions have went for as long as 19 hours. You must have witnessed the dame scene in some of movies like Volcano. But, in real life people are really not that fortunate.