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Granitic magma is highly viscous (resists flow). This high viscosity results in the entrapment and buildup of gases which create explosive eruptions.
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∙ 12y ago
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What type of magma causes violent erpuptions?
Highly viscous felsic magma causes the most violent volcanic eruptions.
Magma that is low in silica and produces nonexplosive eruptions?
Low viscosity mafic magma.
What makes a valcano errupt?
If the rocks below the volcano melt, the liquid rock will gather in a chamber underground. As the pressure in this chamber increases the magma may be forced out. This is an eruption. Eruptions are more likely to be explosive if the magma contains a large amount of water or gas, as the expansion of the water or gas makes the magma explode as it is released.
Why is silica rich magma explosive?
This is because silica-rich magma is thicker. The thicker the magma, the chance for the dissolved gas in there to escape is less likely. This causes an explosion. When the gases do escape, they cause an even bigger explosion
What is the difference between basaltic magma and silicic magma?
Granitic rocks are intrusive, which means they crystallized underground. Basaltic rocks are extrusive, meaning they crystallized above ground. Also, basaltic rocks are more mafic, and granitic rocks are more felsic.
What is the source of materials for volcanoes that erupt in both ways how do you know?
Crusts must have both granitic (continental) plate and basaltic (oceanic) plate to cause both explosive (granitic magma) and non-explosive (basaltic magma) eruptions
Does thin magma cause explosive eruptions?
No, quiet eruptions.
What type of magma will produce explosive eruptions?
Felsic magmas that are high in silica content and are highly viscous produce explosive eruptions.
Does low silica magma cause explosive volcanic eruptions?
Not usually. Explosive eruptions are more often to magma with high or moderate silica levels.
Do silica-rich magma cause explosive eruptions?
yes
What type of magma that tends to cause explosive eruptions has a what?
High temperature
What is trapped in magma that can cause explosive eruptions?
Gas, primarily water vapor.
Gas trapped in magma under high pressure can cause explosive eruptions.?
Yes. The gas is actually the primary driving force behind explosive eruptions.
Can Gas trapped in magma under high pressure can cause explosive eruptions.?
Yes. The gas is actually the primary driving force behind explosive eruptions.
Does mafic magma explode?
Mafic magma can be involced in both explosive and non-explosive eruptions.
An explosive eruption occurs if magma is?
Eruptions are explosive if the magma is viscous and has a high gas content.
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 :)
