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The style of the volcanic eruption is very dependent on the amount of dissolved gas that is in the magma (liquid rock below the surface). If there is a high gas content the volcanic eruption will be explosive and create a log of ash. If the gas content is low the eruption produces more lava flows.

An example of a high gas content eruption was the last major eruption of Mt. St. Helens in 1980.

An example of a low gas content eruption would be the Hawaiian volcanoes.

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Q: Why do some volcanoes erupt ash and others lava?
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Related questions

Do all volcanoes erupt lava?

Lava emissions are found with all active volcanoes, although some volcano emit more lave than others.


Do volcanos erupt differently?

No, not all volcanoes would erupt the same way. Some volcanoes erupt by explosion while others barely trickle lava down the volcano.


Why do some volcanoes erupt while others erupt quietly?

This is because of the time of volcano it is and the type of lava it excretes. A steep volcano will erupt with basaltic lava which is runny and can clog at the top. A shield volcano, however is different as the thick lava emitted just glops onward.


How bad are volcanoes once they start to erupt?

some are very bad,some are normal with lava,and some just spew out ashes


How bad are the damages after a volcano just erupt?

Depends on the size of the volcano and the clumps of lava, some volcanoes dolittle damage but some volcanoes destroy entire villages


What shoots out of a volcano during an eruption?

It depends on the type of eruption. Some will erupt lava or a mixture of lava and gas. Others will erupt gas, ash, and pumice.


Do all volcanos erupt?

no all the volcanoes do not erupt.there are three types of volcanoes extinct,average and active. no because there are dome mountains that do not erupt and they are full of lava and they will erupt in more or less than 300 years.


How many times does a volcano erupt in a century?

Very varied. Some volcanoes erupt almost continuously, others erupt at periods of some hundreds of years.


How many times does volcanoes go off?

It depends on the volcano. Some volcanoes can erupt very often, while others will only erupt once every hundred years.


What type of volcano does and does not erupt?

Active volcanoes erupt. Dormant volcanoes are quiet - but may erupt again some day. Extinct volcanoes have "closed up shop" for good, and will never erupt again.


How do you use Volcano in a sentence?

A ring of volcanoes surrounds the northern Pacific Ocean, some of which are active and spew lava and others of which are dormant mountain peaks.


Do shield volcanoes contain mafic or felsic lava?

Yes. Many stratovolcanoes vary in the composition of what they erupt over time. They may cycle in the type of material. As the magma chamber cools, the magma somtimes becomes more felsic only to periodically receive and injection of fresh mafic magma from the mantle.