Volcanoes can be either explosive or non-explosive but there is a more detailed and complex system of classification. There are six types of volcanic eruptions – Icelandic, Hawaiian, Strombolian, Vulcanian, Pelean and Plinian. Mount Vesuvius is classified as a Plinian volcanic eruption which means that it is viscous, extremely explosive, has gas-rich magma and huge eruption columns that can reach a height of forty-five kilometres into the atmosphere. Plinian eruptions are associated with composite volcanoes such as Mount Vesuvius and other mountains such as St. Helens, Fuji and Pinatubo. The Plinian eruption is named after a Roman admiral who died in the eruption of Vesuvius in 79 A.D. His nephew, Pliny, documented the eruption from a boat.

During The 79 A.D eruption of Mount Vesuvius, among other hazards associated with the volcano, the pyroclastic flow was the most predominant killer. The people of Pompeii had a great deal of difficulty trying to out-run the pyroclastic flow because of the fast moving clouds of gas and rock which travelled at speeds of up to 700km/h, but generally at about 100km/h. This gas, while being extremely toxic, is also of extremely high heat – over 400 degrees Celsius. When the pyroclastic material is hot and glowing, it is referred to as “nuée ardente” meaning “glowing clouds” in French.
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