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What is a low-silica magma?
A low-silica magma has a lower concentration of silica oxide compared to high-silica magmas. This type of magma is typically associated with basaltic or mafic compositions, which have higher temperatures and lower viscosity, allowing for easier flow and the formation of shield volcanoes.
What is the silica content of magma?
The silica content of magma typically ranges from about 40% to 75%. Magma with higher silica content tends to be more viscous and explosive, while magma with lower silica content is typically more fluid and less explosive.
What magma composition does Mt Hekla have?
Mt. Hekla in Iceland has a composition of intermediate to felsic magma, which is rich in silica, giving it a higher viscosity compared to basaltic magma. This type of magma can lead to explosive eruptions.
How does magma composition and the resulting eruption affect the form of a volcano?
If the composition of the magma is high in silica, the eruption will be explosive. The Eruption of Mt. St. Helens was an explosive eruption. If the composition of the magma is low in silica, it will produce a quiet eruption. The eruption(s) of Mt. Kilauea are quiet eruptions.
What is the type of magma Mt fuji has?
Scientists have identified distinct phases of volcanic activity in the formation of Mt. Fuji. The first phase is composed of an andesite which forms the deep core of the volcano and this is covered by later basalt lavas.
