Pay attention to the following text and answer the question number 1-6.
Volcanic Eruption in Indonesia
A volcanic eruption occurs when lava gas, molten rock, ash and steam of a volcano pour through a vent in the earth’s crust. Several volcanoes might be active in eruption, dormant (do not erupting at the present time) or extinct or not active anymore. One of the country in the world who has many active volcanoes is Indonesia. An active volcano erupts in an unpredicted time. Many active volcanoes in Indonesia have erupted and caused hundreds of victims. The following is the diagram showing the eruption of volcanoes in Indonesia including the total victims caused by the eruptions.
The occurence of the volcanic eruption of an active volcano based on the text above is....