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There are two major factors in how a volcano will erupt: the viscosity of the magma (underground molten rock) and how much gas is in the magma.

Viscosity is the resistance of a liquid to flowing. For example syrup is more viscous than water. Magma varies in viscosity, and the magma that forms glowing red lava flows is of the least viscous type. The magma involved in the eruption that buried Pompeii was far more viscous, so it could not flow easily out of the volcano.

Gas is what drives the explosive force of an eruption. The gas is trapped in the magma under pressure and is released as the magma nears the surface. The more viscous types of magma usually have more gas. This holds true at Mount Vesuvius. Even more gas was probably added as seawater seeped into the volcano and turned to water vapor. When the highly viscous, gas-rich magma of Vesuvius came out, the exploding gasses blasted it into tiny fragments, called ash, and which remained suspended in enormous ash clouds.

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Q: Why did Mount Vesuvius have so much ash when it erupted?
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Related questions

How did Pompeii get covered in ash?

Pompeii was covered in 9 feet of volcanc ash when Vesuvius erupted.


What caused Mount Vesuvius to bury Pompeii?

Mount Vesuvius is an active volcano, it erupted spewing ash onto Pompeii.


Is pompeii a legend?

No it was not. It was a Roman town which was buried in volcanic ash when Mount Vesuvius erupted in 79 AD.


What is the damage of vesuvius?

Mount Vesuvius erupted in Pompeii. It surrounded most of the city in pumice and ash. The entire city of Pompeii had been killed by the eruption.


What are facts about Pompeii and mtVesuveus?

Mount Vesuvius erupted in AD 79, when the whole town of Pomeii was covered in ash!


Why was Pompeii completely buried by the Mount Vesuvius?

It was buried by Mount Vesuvius because of all the ash and stuff that came out of the volcano when it erupted. Might want to double check on wiki or something.


Which volcano errupted in AD79 in pompeii?

Mount Vesuvius erupted in 79 AD causing the damage in Pompeii.Mount Vesuvius erupted in 79 AD causing the damage in Pompeii.Mount Vesuvius erupted in 79 AD causing the damage in Pompeii.Mount Vesuvius erupted in 79 AD causing the damage in Pompeii.Mount Vesuvius erupted in 79 AD causing the damage in Pompeii.Mount Vesuvius erupted in 79 AD causing the damage in Pompeii.Mount Vesuvius erupted in 79 AD causing the damage in Pompeii.Mount Vesuvius erupted in 79 AD causing the damage in Pompeii.Mount Vesuvius erupted in 79 AD causing the damage in Pompeii.


What happened in bay of naples in 79 AD?

Pompeii got destroyed by mount vesuvius' pyroclastic flow.Now in pompeii there is concrete bodys on the ground!!


But do you know the name of the volcano that erupted covering the city in ash and freezing it in time in Pompeii?

The name of the volcano is Mount Vesuvius


When did an ancient city of Pompeii get buried in ash?

when vesuvius erupted


What Italian city was covered in lava when the volcano Mount Vesuvius erupted?

There were four cities, most famous Pompii


Why did vesuvius erupt sideways?

It didn't. Mount Vesuvius erupted vertically. However, the ash cloud was carried toward Pompeii by the wind. Additionally, clouds of ash and pumice that were too dense to rise formed pyroclastic flows that raced down the sides of the volcano.