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The main cause of an explosive volcano is the amount of gases trapped in the magma. If the gases have had time to escape, there will be less pressure built up resulting in a less vicious magma explosion.
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Which of the following causes a magma to be less viscous?
fewer silicate chains in the magma
Is felsic magma viscous?
Yes. Felsic magma is very viscous.
What content in magma causes an explosive eruption?
Water and silicates are common components of the viscous lava that can expand explosively in an eruption.
Why are Hawaiians volcanic eruptions less violent?
Compared with some other volcanoes around the world, the Hawaiian volcanoes are fed by low-viscosity magma with a low gas content. The explosive power of a volcanic eruption is driven by gas trapped in the magma, and magma that is more viscous allows more pressure to build up. The magma in the Hawaiian volcanoes flows out fairly readily.
What is the most viscous magma types?
the hot type
Which of the following causes a magma to be less viscous?
fewer silicate chains in the magma
Is felsic magma viscous?
Yes. Felsic magma is very viscous.
How high can volcanic eruptions occur into the air?
That all depends on how viscous the magma (though out of the earth it's called lava) is. More viscous, the bigger and higher it gets. The less viscous, the less violent the explosion can and will be.
What type of magma causes violent erpuptions?
Highly viscous felsic magma causes the most violent volcanic eruptions.
What content in magma causes an explosive eruption?
Water and silicates are common components of the viscous lava that can expand explosively in an eruption.
What are the magma types in order of decreasing viscosity?
Most viscous Felsic magma i.e. rhyolite Intermediate magma i.e. andersite Mafic magma i.e. Basalt Ultramafic magma i.e. Komatiite Least viscous
An anemia resulting from a decrease RBC number causes the blood to become?
less viscous.
Why are Hawaiians volcanic eruptions less violent?
Compared with some other volcanoes around the world, the Hawaiian volcanoes are fed by low-viscosity magma with a low gas content. The explosive power of a volcanic eruption is driven by gas trapped in the magma, and magma that is more viscous allows more pressure to build up. The magma in the Hawaiian volcanoes flows out fairly readily.
What is the most viscous magma types?
the hot type
What type of magma is most likely to cause a volcano to explode?
Magma that is high in silica content, known as felsic magma, is most likely to cause a volcano to explode. Felsic magma is highly viscous and can trap gas bubbles, leading to high pressure build-up within the volcano. When this pressure is released explosively, it can result in a volcanic explosion.
What causes volcanoes to erupt violently while others simply leak molten rock?
There are two main factors factors: gas content and magma viscosity. All magma has some amount of gas dissolved in it. This gas is released when the magma is exposed to lower pressure near the surface. In magma with a high gas content the gas bubbles out of solution and expands explosively in the presence of low pressure. If the gas content is low it may only result in a bit of bubbling. Viscosity is the tendency of a liquid to resist flowing. For example, maple syrup is more viscous than water. Magma varies in viscosity depnding on its temperature and composition. Lower temperatures and higher silica content make a more viscous magma. More viscous magmas usually have a higher gas concentration. Additionally, in viscous magmas, the gas is less likely to escape ahead of the magma in the prelude to an eruption.
Why do mafic magmas tend to reach the surface much more often than silicic magmas?
Mafic magma is less viscous or more fluid than silicic magma in much the same way that water is less viscous than molasses. Mafic magma reaches the surface more often because it flows more easily.
