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Andesitic magma has intermediate silica content. Rhyolite has the highest(>68%) and Basaltic the least.
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Which flows easier high silica magna or low silica magna?
High silica magma is more viscous (sticky) than low silica magma, so low silica magma lows easier.
What does high level of silica cause magma to become?
High levels of silica cause magma to be more viscous
Do gases escape from a low silica magma easier than it does a high silica magma?
yes
Magma that is high in silica and produces explosive eruptions?
High silica magma is light in color, thick, sticky and less dense than basalt magma. The magma that forma volcanoes is rich in silica. High silica magma have low temperatures because magma that is high in silica have the lowest temperatures. Silica rich magma builds a tall cone shaped volcano, a Stratovolcano. Magma that is high in silica resists flowing, so expanding gases are trapped in it. Pressure builds up until the gases blast out in a violent, dangerous explosion.
What is a low-silica magma?
A magma containing not much silica (= SiO2). For example: a basaltic magma. These magma's have a low viscosity since the lower the SiO2-content, the lower the viscosity; and hence flow easily (↔ a felsic magma).
Which flows easier high silica magna or low silica magna?
High silica magma is more viscous (sticky) than low silica magma, so low silica magma lows easier.
What does high level of silica cause magma to become?
High levels of silica cause magma to be more viscous
What does the amount of silica in a volcanos magma determine about its eruption?
If a volcano's magma is high in silica, the volcano will probably erupt explosively. If the magma is not high in silica, the volcano will probably erupt quietly.
Do gases escape from a low silica magma easier than it does a high silica magma?
yes
Magma that is high in silica and produces explosive eruptions?
High silica magma is light in color, thick, sticky and less dense than basalt magma. The magma that forma volcanoes is rich in silica. High silica magma have low temperatures because magma that is high in silica have the lowest temperatures. Silica rich magma builds a tall cone shaped volcano, a Stratovolcano. Magma that is high in silica resists flowing, so expanding gases are trapped in it. Pressure builds up until the gases blast out in a violent, dangerous explosion.
Does the increase in silica increase the viscosity of a magma?
it is normally intermediate flow because of the silica content.
What conditions make for a violent volcanic eruption?
Magma with high silica content
What causes the difference between quiet and exploses eruptions?
It depends on how much silica is in the magma. If there is low-silica in the magma then the volcano will erupt quietly. If there is high-silica in the magma then the volcano will erupt explosively.
What is a low-silica magma?
A magma containing not much silica (= SiO2). For example: a basaltic magma. These magma's have a low viscosity since the lower the SiO2-content, the lower the viscosity; and hence flow easily (↔ a felsic magma).
What type of magma has a high silica content?
rhyolitic magma has a lot of silica and water vapors... thanks for asking answers.com ;)
Does low silica magma cause explosive volcanic eruptions?
Not usually. Explosive eruptions are more often to magma with high or moderate silica levels.
Does Pinatubo have silicia?
The magma of all volcanoes contains silica. The 1991 eruption of Mount Pinatubo involved dacite magma, which has a high silica composition.
