Some volcanoes occur in the middle of tectonic plates and are created as the plate moves over a hot part of the Earths interior. Magma can vary in viscosity the resistance to flow.
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Volcanoes erupt explosively or quietly depending on the characteristics of the magma.
Why do some volcanoes erupt violently. T he magma isnt very liquid-y so it is able to trap gases in the depths allowing the pressure inside the volcano to build. On the steepest slopes the mudflows traveled up to 144 kilometers per hour 90 miles per hour. After the eruption streams were choked with rock and mud.
The primary factors that determine the nature of volcanic eruptions include the magmas temperature its composition and the amount of dissolved gases it contains. Scientists want to know why certain eruptions of molten rock are more violent than others and they may have found clues in chemistry. When water mixed with rock and mud it created volcanic mudflows also called lahars that were able to move down the volcanos slopes.
They form from explosions of red hot magma cinders and ash. The viscosity of magma is directly related to its silica content. Volcanic eruptions are the most spectacular expression of the processes acting in the interior of any active planet.
In order for a volcanic eruption to occur a volcano must contain an alloy that is nothing but liquefied rock. The materials in the volcanoeruption will force its way out and it creates a loud bang andthe ground shakes violently. The composition of this alloy determines what the eruption will look like says the professor.
If a magma is made of material that is very stiff and viscous slow flowing - like tar the gas cant easily escape. There are several reasons that influence volcanic hazards these include the viscosity of the magma proximity to population centres materials that are ejected from the volcano the magnitude of the eruption and the plate margin that the volcano rests upon. Why are some volcanoes more explosive.
Scientists want to know why certain eruptions of molten rock are more violent than others and they may have found clues in chemistry. If the pressure is strong enough and the area of the Earths crust is weak enough an eruption will occur and fling rock ash gas and sometimes lava into the air or dribbling off its sides. As lava cools it begins to congeal and as viscosity increases its mobility decreases.
Magma will ascend to find a new state of. If a vulcanian style eruption were to occur blocks 3 or 4 metres in dimension will be dropping out of the sky. Greater proportions of silica make the magma denser and denser so more gas becomes trapped.
Effusive eruptions consist of a gentle and steady flow of lava on the surface while explosive eruptions are violent phenomena that can eject hot materials up to. Volcanoes that have more basalt rock give rise to moderate explosions. When large volumes of ice on top of volcanoes melt the pressure above the magma chamber decreases.
Cinder cones are known for. The trapped gas accumulates until there is enough to overcome the magmas viscosity and then there can be a very powerful explosion as the gas breaks through the magma. Some of the lava hardens on thevent causing a blockage of the vent.
Rhyolite rock has a greater percentage of silica than other varieties. Because the gases in the magma accumulate and when the pressure decreases they explode and push the magma out creating an explosive eruption. The more explosive volcanoes are kind of.
Here are some facts about spatter volcanoes. As the plate continues to move across the hot spot a. The oozing sort of.
The viscosity of the magma depends on 3 things the temperature dissolved. We then go to the bread dough magma - so high in silica that gases are trapped pressure builds up and the volcano erupts in an explosive eruption. Basically There are 5 types of volcanic eruptions.
A spatter fountain is usually only a few meters high. Types of volcanic eruptions. Spatter fountains do not shoot up as high as the fountains created in the kind of eruption that you probably imagine when you think of a volcano.
This is the reason that magma is explosive or the eruption is explosive. Hence some volcanoes usually those that have more than 50 silica in the magma are more likely to explode. The researcher explains that volatiles are a component of the alloy which plays an important role in violent explosions.
When these volcanoes erupt they explode with a bang. These cinders and ash settle around the main vent and build a steep sided cone. Why do some volcanoes erupt violently while others erupt quietly.
It is one of the most active volcanoes in Europe and its last major eruption was 17 years ago. Why Are Some Volcanoes More Hazardous Than Others. The eruption of a spatter volcano may look more like a fire than a volcano eruption.
Magma with high viscosity is thick and resists flowing. Stromboli is like the fizzy drink Vulcano the syrup. We look at why volcanoes exist in the first place and why some erupt when others dont.
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