Understanding Volcanoes and their Types

As the concentration of silica increases, resistance (viscosity) to magma flow increases. Compared to basaltic magma, andesite magma with high silica content constitutes the majority of composite volcanic clastic material. This silica-rich and volatile magma is the reason to separate the composite volcano from the shield volcano. Anshan magma dominates fragments of fragments, but some magma invades into a cone like a window frame or a dam. Because of this multiple invasion, the strength of the structural framework can be obtained, so the composite volcano is higher than the composite volcano consisting only of debris material.

Shield volcano is the largest volcano on the earth and actually looks like a volcano (in other words, it does not calculate the flow of the flood basalt). Hawaiian Shield Volcano is the most famous example. Shield volcano is almost completely basalt, and it is a lava flow which flows very much during the eruption. For this reason, these volcanoes are not steep (you can not accumulate fluids that tend to flow down the mountain). If water enters the crater in some way, the shield volcanic eruption will only explode. . Shield volcano is the result of high magma supply rate; from the moment of occurrence, lava is very hot with little change. Shield volcanoes are a common product of hot volcanic activity, but they can also be found along volcanic arcs associated with subduction or all alone.

According to the State University of San Diego, Thinder cone volcanoes (also called volcanic cones) are the most common types of volcanoes and they are what we consider as a normally symmetric conical volcano. They can occur as a single volcano on either side of a volcanic or shielded volcano, or as a secondary volcano called a "parasitic cone." Lava fragments in the air called tephras are discharged from vents. According to the US Geological Survey, the lava is rapidly cooled and falls with the ash accumulating around the vents, creating a crater at the top of the mountain. The Thinder cone volcano is very small, typically only 300 feet (91 meters) high, at most 1,200 feet (366 meters). They can accumulate in a short period of months or years

Volcanoes can be classified by type. Structure and composition determine the type of volcano. Shield volcano is a dome-shaped mountain of lowland formed by lava and flows easily and covers a wide area. Thinder cone volcanoes are the simplest form, and they are normally discharged from the vent with a bowl shaped crater at the top of the mountain. Complex or layered volcanoes are the most common type, they are towering mountains, steep slopes, alternating interior rock layers and magmatic layers. The two basic classifications of volcanoes are based on the type of volcanic eruption they produce: explosive (or middle) and quiet (or crack). Explosive volcanic eruptions are caused by the accumulation of gas under high viscosity (thick and slow flowing) magma deep inside the volcano. Volcanic eruptions are rapid and violent, often releasing lava, volcanic ash, and volcanic substances. Quiet eruptions usually emit lots of lava during long cracks and breaks.