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What do highly explosive volcanoes tend to have what type of magma?
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Higly explosive volcanoes tend to have what type of magma?
Magma with high silica, high viscosity, and higher gas content.
A volcano with a magma supply which is felsic and has a high viscosity will tend to have what type of eruption?
A volcano fed by felsic magma will tend to have explosive eruptions.
Why are the eruptions of stratovolcanoes usually more destructive than the eruptions of cinder cone volcanoes?
Cindercone volcanoes erupt relative small amounts of magma, compared with stratovolcanoes, which not only hold more magma, but often more viscous magma with a higher gas content. This means eruptions tend to be larger and more explosive. As a result, cinder cones primarily erupt fountains of lava while stratovolcanoes tend to erupt massive ash clouds and pyroclastic flows.
What does viscosity have to do with eruptions?
The viscosity of magma or lava will determine whether or not the eruption is explosive or quiet. Higher viscosity magma can result in explosive eruptions. Lower viscosity magmas tend to flow more freely.
Why does lava flow fast when it comes out of a volcano but then it flows slower and slower and eventually stop?
Its mainly due to the type of magma being produced. Highly viscous magmas that are high in silica tend to occur in explosive volcanoes. Low viscosity magmas that flow easily are associated with non explosive volcanoes.
Higly explosive volcanoes tend to have what type of magma?
Magma with high silica, high viscosity, and higher gas content.
Do hot spot volcanoes tend to erupt more explosively than other volcanoes?
The source is not as important as the gas content and viscosity. For example, Kilauea in Hawaii doesn't erupt very explosively; it is just a fire fountain. The more explosive volcanoes are those with a blocked magma chamber that builds pressure under a solid surface. Hotspot volcanoes tend to be less explosive because most are on the seafloor.
A volcano with a magma supply which is felsic and has a high viscosity will tend to have what type of eruption?
A volcano fed by felsic magma will tend to have explosive eruptions.
Do hot spot volcanoes tend to erupt more explosively than other volcano?
The source is not as important as the gas content and viscosity. For example, Kilauea in Hawaii doesn't erupt very explosively; it is just a fire fountain. The more explosive volcanoes are those with a blocked magma chamber that builds pressure under a solid surface. Hotspot volcanoes tend to be less explosive because most are on the seafloor.
Why are the eruptions of stratovolcanoes usually more destructive than the eruptions of cinder cone volcanoes?
Cindercone volcanoes erupt relative small amounts of magma, compared with stratovolcanoes, which not only hold more magma, but often more viscous magma with a higher gas content. This means eruptions tend to be larger and more explosive. As a result, cinder cones primarily erupt fountains of lava while stratovolcanoes tend to erupt massive ash clouds and pyroclastic flows.
What does viscosity have to do with eruptions?
The viscosity of magma or lava will determine whether or not the eruption is explosive or quiet. Higher viscosity magma can result in explosive eruptions. Lower viscosity magmas tend to flow more freely.
Why does lava flow fast when it comes out of a volcano but then it flows slower and slower and eventually stop?
Its mainly due to the type of magma being produced. Highly viscous magmas that are high in silica tend to occur in explosive volcanoes. Low viscosity magmas that flow easily are associated with non explosive volcanoes.
What Tend to increase the explosive potential of magma body beneath a volcano?
high viscosity and dissolved gas
Are volcanoes scattered randomly or are they in concentrated zones?
Volcanoes tend to form mainly along the edges of tectonic plates, or where the magma is particularly thin or weak.
Are the Eyjafjallajokull eruptions violent or mild?
The eruptions would normally be passive in nature, however when the magma mixes with the glaciers present on the volcano it gets more explosive. The volcano is of the same style as Hawaiian volcanoes, however, with the presence of ice the eruptions tend to produce large amounts of steam and ash that can cause explosive outbursts.
What are two reasons that magma with a high silica content tend to cause explosive eruptions?
Magma with a high silica content tend to cause explosive eruptions because it has a stiff consistency and blocks the vents. When magma pushes from behind it more pressure happens which means the eruption will be explosive. It also prevents gas and water vapor from getting out. The gases will expand until it explodes.
What do some explosions from volcanoes cause?
Explosive volcanoes erupt suddenly, with terrifying force. These form when magma has cooled to make a lava plug blocking a crater. The plug traps hot gas and magma under the ground, and the hot gas builds up until the pressure becomes too great. When this happens, hot gas and magma explodes out of the volcano in a shower of dust, ashes, cinders, and volcanic bombs. Volcanic bombs are large chunks of molten rock that fly high up into the air and then fall on the countryside around. Explosive volcanoes tend to produce steep cones of volcanic ash. They can if they are powerful enough cause atmospheric and climate problems, not to mention destruction around the site of the eruption.
