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Why do shield volcanoes happen in ocean more than on land?
Shield volcanoes produce flows of mafic lava, also called basaltic lava, which has a lower viscosity and low silica content. Oceanic crust has the same composition and so it is fairly easy for shield volcanoes to form here. Continental crust has a higher silica content. As a result, many continent based volcanoes produce much more viscous lavas which produce stratovolcanoes rather than shield volcanoes.
How do you know that many of the volcanoes in the western district of Victoria had runny lava?
Many of the volcanoes in the western district of Victoria had runny lava because they were created from basaltic magma, which has a lower viscosity compared to other types of magma. This lower viscosity allowed the lava to flow easily and spread over large areas, resulting in the formation of broad shield volcanoes with gently sloping sides.
Why do siluca poor magmas produce broad volcanoes eith gentle slopes?
Silica-poor magmas, such as basalt, have lower viscosity, allowing them to flow more easily and travel greater distances from the eruption site. This fluid nature results in the formation of broad, gently sloping volcanoes, known as shield volcanoes, as successive lava flows spread out over large areas. Additionally, the lower gas content in silica-poor magmas leads to less explosive eruptions, further contributing to the gentle slopes of these volcanoes.
Do these hot spot volanoes tend to erupt more explosively than other volcanoes?
no they do not erupt more explosively. It depends on its gas and on its viscosity. an example is Kilauea in Hawaii it does not erupt explosively.
Why do silica poor magmas produe broad volcanoes with gentle slopes?
Silica-poor magmas, typically basaltic in composition, have lower viscosity compared to silica-rich magmas. This lower viscosity allows them to flow easily and spread over large distances, resulting in the formation of broad, gently sloped volcanoes. The fluid nature of these eruptions generally leads to less explosive activity, contributing to the broad shape of the volcano. Consequently, the accumulation of layers of low-viscosity lava contributes to the characteristic gentle slopes.
Water has a lower what than honey?
Water has a lower viscosity than honey. Honey is more viscous, or thick and sticky, compared to water.
What temperature are shield volcanoes?
Shield volcanoes typically erupt basaltic lava, which has a relatively low viscosity and can flow easily. The temperatures of the lava during an eruption usually range from about 1,100 to 1,200 degrees Celsius (2,012 to 2,192 degrees Fahrenheit). This lower temperature compared to other types of volcanoes contributes to the broad, gently sloping shape of shield volcanoes.
What is the relation between viscosity and flow-ability of a material?
Viscosity is a measure of a fluid's resistance to flow, with higher viscosity indicating more resistance. The flowability of a material is related to its viscosity, where lower viscosity fluids flow more easily, while higher viscosity fluids flow more slowly. In general, lower viscosity fluids are more fluid and flow easily, while higher viscosity fluids are thicker and flow more sluggishly.
What factors control the viscosity of magma and lava?
The three factors that control the viscosity of lava are temperature, composition and dissolved gases. When the temperature is hotter, there will be less viscous. When the composition has a higher silica content, there will be higher viscosity and a lower silica content means a lower viscosity. The gases will expand within the lava as it nears the surface of the Earth because of decreasing pressure.
What is the relationship in the silicon content and the viscosity of magma?
There is an inverse relationship between magma viscosity and silicon content. Lavas erupting from basaltic volcanoes (like Hawaii) have a much lower viscosity and are much hotter than those erupted by volcanoes whose magmas are rich in silicon. There may be up to 8 orders of magnitude viscosity difference between basaltic magmas (SiO2 contents or about 45 %) and rhyolitic magmas (SiO2 > 70 %).
What is the relation between viscosity and flow ability of a material?
The higher the viscosity, the lower the flow-ability of a material.(Viscosity=internal resistance to flow)
What are some applications of viscosity?
motor oil. higher viscosity better for hot weather, lower for winter
