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What conditions make for a violent volcanic eruption?
Magma with high silica content
What are runny and sticky lava?
Runny lava contains low amounts of silicon, whereas sticky lava contains high amounts of silicon.
Does the increase in silica increase the viscosity of a magma?
it is normally intermediate flow because of the silica content.
Higly explosive volcanoes tend to have what type of magma?
Magma with high silica, high viscosity, and higher gas content.
Why sheet steel with high silicon content is used in transformer core whereas lower silicon content sheet for rotating machine?
high permeability ,low hysterisis,increased resistivity
An explosive eruption occurs if magma is?
Eruptions are explosive if the magma is viscous and has a high gas content.
Why does magma erupt effusively?
Due to high gas content and high viscosity.
What properties of magma help determine the type of eruption?
The properties of magma that help to determine the type of eruption are the magma's viscosity and its silica content. Those volcanoes that exhibit massive eruptions have a high viscosity and high silica content.
What is the relationship between silicon content and the viscosity of magma?
Although other factors such as temperature and water content also affect the viscosity of magma, silica-rich magmas tend to be more viscous than silica-poor magmas in similar situations.
If the water content of magma is high?
an explosive eruption is more likely.
Does a composite volcano have a high gas content?
Yes. Composite volcanoes often have a high gas content in their magma, which is why they often erupt explosively.
Is andiestic magma high in silica?
Andesitic magma has intermediate silica content. Rhyolite has the highest(>68%) and Basaltic the least.
