Хоть не 8-9, ну хоть что то The eruption of the volcano in the process of allocating hot surface of the Earth debris, ash, the outpouring of magma, winding on the surface, it becomes lava. Eruption may be within a period from several hours to many years.
Volcanoes are a geological emergencies that can lead to disaster. In some cases it may even be worse disaster elements.