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Is mount Krakatoa a shield volcano?
No. Caldera and shield volcanoes are quite different. Shield volcanoes usually undergo effusive eruptions, the least violent type and produce basaltic lava. Caldera forming volcanoes erupt explosively and are the most violent. They generally produce rhyolitic lava.
Does a composite volcano erupt quietly or explosively?
A composite volcano is the most explosive type of volcano there is. Mt. St. Helens and Mt.Vesuvious in Pompeii are both examples of composite volcanoes, and look at the damage they did. a composite volcano usually has pyroclastic flows to accompany the traditional lava and ash.
Cinder cones are the most dangerous volcanoes?
Cinder cones are typically small volcanoes that have short and relatively mild eruptions compared to larger composite volcanoes or stratovolcanoes. While they can erupt with explosive force, their eruptions are usually confined to the immediate area surrounding the cone and do not pose as much risk to human populations as other types of volcanoes.
Where are composite volcanoes usually found-?
in the north pole during the winter months.
Why are the eruptions of stratovolcanoes usually more destructive than the eruptions of shield volcanoes?
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Cinder cones are the most dangerous volcanoes?
Cinder cones are typically small volcanoes that have short and relatively mild eruptions compared to larger composite volcanoes or stratovolcanoes. While they can erupt with explosive force, their eruptions are usually confined to the immediate area surrounding the cone and do not pose as much risk to human populations as other types of volcanoes.
What kind of volcanoes form along subduction zones?
Composite or stratovolcanoes typically form along subduction zones. These volcanoes are characterized by their steep-sided profile, explosive eruptions due to the presence of viscous magma, and alternating layers of lava flows and volcanic ash. Subduction zones are where one tectonic plate slides beneath another plate, leading to magma formation and volcanic activity.
Do composite cone volcanoes have mafic lava?
They can. Composite volcanoes vary in what they erupt. Many composite volcanoes are composed of a mixture of mafic, felsic, and intermediate rock. However, in most cases intermediated or felsic rock predominates.
Compare shield volcanoes to composite volcanoes?
A shield volcano is made from lava flows that flow far, making a very wide, not very steep mountain. A cinder cone volcano is the most common type of volcano. It is formed from volcanic fragments and is very steep sided, although not always extremely tall. They usually have just one main vent, and can also sometimes form from a vent of a larger volcano, growing and becoming a whole new volcano. Composite volcanoes resemble very large cinder cone volcanoes at first, but have bigger particles making them up usually and also have multiple vents more often. They also are potentially more explosive.
What are the similarities and differences between the types of volcanoes?
Shield volcanoes have fluid basaltic flows that are lower in silicates, making the lava very fluid without a tendency to form pyroclastics. Composite Cone volcanoes contain the highest percentage of silica content making the magma thicker with the greatest tendency to form pyroclastics and are the most dangerous volcanoes.
Does a cinder cone volcano erupt violently?
Cinder cone volcanoes typically have relatively small and short-lived eruptions characterized by explosive bursts of gas and ash. These eruptions are not usually as violent as those of stratovolcanoes, but they can still pose a hazard to nearby areas.
What are the types of volcano?
There are four main types of volcanoes, namely Shield Volcanoes, Composite Volcanoes, Cinder Cones and Acid-lava Volcano. Shield Volcanoes: * Large base area * Gentle slope * Contains basic lava * Frequent eruptions * Quiet and gentle eruptions * Very tall in height due to large base area Composite Volcanoes: * Relatively small base area * Concave slope * Contains acidic lava * Violent eruptions * Repeated eruptions * Erupts from the side cones * Usually not very tall in height due to gentle slopes Acid-lava Volcanoes * Small base area * Steep slope * Contains acidic lava * Violent eruptions * Creates crater lakes (caldera) after eruptions * Tall in height due to steep slopes Cinder Cones * Small base area * Steep slopes * Symmetrical slopes * Moderate eruptions * Not tall in height as slopes are easily eroded
What type of valcano is Mount Saint Helens?
Mount St. Helens is a stratovolcano, also known as a composite volcano, which is tall and steep with varying layers of lava, ash, and rock. This type of volcano is known for its explosive eruptions caused by the buildup of gas pressure within the magma chamber.
What kind of lava does composite volcanoes produce AA or pahoehoe?
Usually neither. A'a and pahoehoe lavas are both of mafic composition (rich in iron and magnesium, poor in silica) and form basalt when they cool. Composite volcanoes usually erupt material of intermediate to felsic composition (felsic is rich in alkalis, aluminum, and silica), with lavas cooling into rocks such as andesite, dacite, and rhyolite.
Does a composite volcano have silica?
Yes it is high in silica because composite volcanoes are known for being explosive. Composite volcanoes, sometimes referred to as stratovolcanoes, one of Earth's most common type.They form by explosive eruptions of pyroclastic material followed by quieter outpourings of lava. This usually indicates high silica content. High silica makes for thicker magma that can clog up the vent from the volcanoe's last eruption. Which makes the next eruption far more explosive because the magma has to free its self out of the vent, and with tremendous force it succeeds sky rocketing billions of pieces of pyroclastic material out of its vent. (this is known as an explosive eruption.)
What kind of lava do caldera volcanoes produce?
Caldera-forming eruptions do not involce lava flows but massive plumes of ash and pumice. The material produced is usually rhyolite. After a caldera-forming eruption, however, the composition can shift, especially since eruptions can be triggered by the mixing of different types of magma.
Are cinder cone volcanoes gentle and long-lasting?
No. Cinder cones usually produce relatively explosive eruptions and are short-lived. Some only erupt for a few years before going extinct.
