When do volcanoes become dangerous?

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When do volcanoes become dangerous?



We can call a volcano dangerous only when it causes damage to human life. For instance, if a volcano erupts on the almost uninhabited East-Asian peninsula of Kamchatka, it is hardly reported in the news. But, if a volcano starts spewing hot gases and ash in a densely populated area, many lives are at risk. Explosive volcanic eruptions discharge huge quantities of dust and ash, often burying neighboring areas. Thin, dark magma can flow at a fast speed of up to 100 km/h marking it eruptions can also have far-reaching consequences. When the Indonesian volcanic Krakatoa erupted in 1883, the volcanic ash reached up to a height of 80 km, which for some time darkened the sky worldwide. 


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