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The explosive potential of a volcano is determined by two primary factors:
- Gas within the magma
- Viscosity of the magma
The combination of the gas and the viscosity determine the explosive potential of the magma as a result of the ability for the magma to flow as well as if it can release the dissolved gasses in a passive manner.
Volcanoes that have a high concentration of Silica in their magma traditionally have a tendency to erupt more explosively. In the case of basalt, although there is traditionally a high level of dissolved gasses within the magma, basalt can easily flow. The ability for basalt to easily flow allows for the passive release of the gasses that are dissolved in the magma resulting in a non-explosive eruption as the gasses are released over time as the magma reaches the surface and not catastrophically as the magma escapes.
What else can I help you with?
Explain how the presence of silica and water in magma increases the chances of an explosive eruption?
The higher the silica content of the magma, the more explosive the eruption. Magma enriched in silica has a higher viscosity (resistance to flow). Pressures are more likely to build up behind the thicker, high silica content magma and result in potentially more explosive eruptions.
What does magma with high silica content form?
When it cools and crystallizes into rock, the rock will be described as felsic igneous rock. Examples of felsic igneous rocks are granite, rhyolite, and pumice.
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 type of magma does Mt Etna have?
The composition of Mt. Etna is basaltic.
Which igneous rock forms when basaltic magma hardens?
Intrusive rock
What kind of of volcanic eruption occurs when basaltic magma is present?
Basaltic magma usually produces a Hawaiian or Stombolian style of eruption.
What eruption occurs when basaltic magma is present?
quiet
What type of magma is the most powerful when it comes to unleashing very explosive volcanic eruption?
Basaltic
If basalt is in lava is the volcano explosive?
Basaltic lava tends to be less explosive than other types of lava because it has lower viscosity and gas content. However, the explosiveness of a volcano is influenced by multiple factors including the volcano's history, magma composition, and gas content. While basaltic lava eruptions are typically less explosive, there can be exceptions.
What is Magma that is high in silica and produces explosive eruption is called?
Rhyolitic magma. Boom! Basaltic magma is its exact opposite, while andesitic magma is in between the two.
How the composition of magma determines an eruption's characteristics?
Silica(te) rich magma is usually an explosive eruption. The explosiveness of an eruption depends on - a) Gases trapped within the magma at eruption b) The Silica content c) The fragility of the crater walls and/or the volcanic plug.
What about magma affects how explosive an eruption will be?
The composition of the magma affects how explosive a volcanic eruption will be.
What type of eruption does basaltic magma have?
The type of volcano and eruption from basaltic magma would be a cinder cone volcano. The eruption would be a mild explosive eruption. It would be mainly ash and scoria.
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.
How can the composition of magma affect the way volcano erupts?
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.
Which is not a characteristic of magma from an explosive eruption?
flows easily
What cause a quiet eruption?
Basaltic magma is forced upward in a vent
