0
What is the silica content of lava in volcanoes where quiet or non explosive eruptions occur?
Wiki User
∙ 12y ago
in quiet eruptions, the magma or lava contains more silica than explosive eruptions. in explosive eruptions magma has less silica because lava becomes less dense and can shoot out of an volcano
Wiki User
∙ 11y ago
Wiki User
∙ 9y agoThe textbook answer would be that a composite volcano is composed of high-silica material. In reality composite volcanoes are highly variable. Mount St Helens, a composite volcano, has erupted material ranging from low-silica basalt to high-silica dacite.
Wiki User
∙ 9y agoThe textbook answer would be that composite volcanoes erupt high-silica material. In reality they are highly variable, sometimes erupting different types of material at different times. Mount St. Helens, for example, has primarily erupted high-silica dacite in modern times, but layers of moderate-silica andesite and low-silica basalt have been found.
Wiki User
∙ 12y agoIn general, the silica content of lava in less explosive more "quiet" eruptions will be low, with a higher temperature and lower gas content as all these parameters act to reduce the viscosity of the lava making it flow more easily and so less likely to form a viscous "plug" that can result in an explosive eruption as well as reducing the tendency for rapid exsolution of gas which can also make an eruption more explosive.
The reciprocal of this is also true, whereby If the temperature of the lava is decreased or the silica content increases then the viscosity of the lava will increase making an explosive / noisy eruption more likely to occur.
For more information please see the related link.
Wiki User
∙ 15y agoQuiet volcanoes usually have a low viscosity, low silica magma.
Wiki User
∙ 13y agosence it has very low viscosity it would have low silica, i think....not for sure.
Wiki User
∙ 11y agoI am sorry to disappoint you... But there are currently no reasonable answers for this question. Go ask a real scientist!
Wiki User
∙ 12y agoVery low amount of silica.
Wiki User
∙ 11y agolow silica
Add your answer:
Earn +20 pts
A light colored igneous rock with silica content and explosive eruptions?
Andesite
What is common of most volcanoes that have the most violent eruptions?
They feature magma with very high silica content.
Does low silica magma cause explosive volcanic eruptions?
Not usually. Explosive eruptions are more often to magma with high or moderate silica levels.
How are volcanic eruptions affected by the type of lava?
The more silaceous the lava, (higher silica content), the more explosive the eruption.
Does Hawaii experience effusive or explosive eruptions?
Occasionally, yes. Most of Kilauea's eruptions are effusive, however.
A light colored igneous rock with silica content and explosive eruptions?
Andesite
What is common of most volcanoes that have the most violent eruptions?
They feature magma with very high silica content.
Does low silica magma cause explosive volcanic eruptions?
Not usually. Explosive eruptions are more often to magma with high or moderate silica levels.
How are volcanic eruptions affected by the type of lava?
The more silaceous the lava, (higher silica content), the more explosive the eruption.
Does Hawaii experience effusive or explosive eruptions?
Occasionally, yes. Most of Kilauea's eruptions are effusive, however.
Why is silica rich magma associated with explosive eruptions?
silica rich magma associated with explosive eruptions because it tends to trap water and gas bubbles :)
What type of material do explosive volcanoes produce?
An explosive eruption is caused by magma with a high content of water and silica. Non-explosive eruptions are caused by either lava because it is a thicker consistency, or magma with a low content of water and silica.
Higly explosive volcanoes tend to have what type of magma?
Magma with high silica, high viscosity, and higher gas content.
Do silica-rich magma cause explosive eruptions?
yes
Does mt.st.helens have a high or low silica content?
Because Mount Rainier is a Strato Volcano it has both quiet and explosive eruptions. Explosive(pyroclastic) flows have a high silica level. Quiet have low silica levels. The more silica the thicker the magma.
What type of magma do highly explosive volcanoes have?
Many have rhyolitic magma, which is high in silica. Magma with higher viscosity and higher gas content is the most explosive when released.
Does a composite volcano have silica?
Yes it is high in silica because composite volcanoes are known for being explosive. Composite volcanoes, sometimes referred to as stratovolcanoes, one of Earth's most common type.They form by explosive eruptions of pyroclastic material followed by quieter outpourings of lava. This usually indicates high silica content. High silica makes for thicker magma that can clog up the vent from the volcanoe's last eruption. Which makes the next eruption far more explosive because the magma has to free its self out of the vent, and with tremendous force it succeeds sky rocketing billions of pieces of pyroclastic material out of its vent. (this is known as an explosive eruption.)
