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Which type of lava-basaltic lava or rhyolitic lava flows faster and why?
Basaltic flows much faster than rhyolite. Rhyolite is higher viscosity. Find a video of a basaltic lava flow like Hawaii, it flows like water when it's hot. Rhyolite eruptions usually act more like toothpaste if they're slow, or an explosion if fast.
Correct order of decreasing magma viscosity?
The amount of viscosity present in magma depends on the amount of silica it has. A composite volcano produces rhyolitic lava which is very thick. A shield volcano produces a basaltic lava with less silica and significantly less viscosity.
Does balsaltic lava have a high gas content?
Basaltic lava typically has a low gas content compared to other types of lava such as andesitic or rhyolitic. This is because basaltic lava is less viscous, allowing gases to escape more easily, resulting in less gas being trapped within the lava as it erupts.
What is the consistency of basaltic lava?
No, it is actually one of the less viscous.The viscosity increasing when the composition of Felsic minerals make larger.That is, basalt lavas are more fluent than felsic lavas such as lavas from andesite of rhyolite. Also, the more viscosity, the more explosive.
Is basaltic lava less fluid than andesitic lava?
No, basaltic lava is typically more fluid than andesitic lava due to its lower silica content. This results in basaltic lava flowing more easily and spreading over larger areas compared to andesitic lava.
Which type of lava-basaltic lava or rhyolitic lava flows faster and why?
Basaltic flows much faster than rhyolite. Rhyolite is higher viscosity. Find a video of a basaltic lava flow like Hawaii, it flows like water when it's hot. Rhyolite eruptions usually act more like toothpaste if they're slow, or an explosion if fast.
Correct order of decreasing magma viscosity?
The amount of viscosity present in magma depends on the amount of silica it has. A composite volcano produces rhyolitic lava which is very thick. A shield volcano produces a basaltic lava with less silica and significantly less viscosity.
How is basaltic lava different from granitic lava?
Basaltic lava is far less viscous, has less silica, erupts at a higher temperature and is denser than granitic lava (properly called rhyolitic lava when it is on the surface). Basaltic lava is composed primarily of pyroxenes and calcium rich plagioclase with small amounts of olivine. Rhyolitic lava primarily contains alkali feldspars and quartz.
Does balsaltic lava have a high gas content?
Basaltic lava typically has a low gas content compared to other types of lava such as andesitic or rhyolitic. This is because basaltic lava is less viscous, allowing gases to escape more easily, resulting in less gas being trapped within the lava as it erupts.
What is the consistency of basaltic lava?
No, it is actually one of the less viscous.The viscosity increasing when the composition of Felsic minerals make larger.That is, basalt lavas are more fluent than felsic lavas such as lavas from andesite of rhyolite. Also, the more viscosity, the more explosive.
Is basaltic lava less fluid than andesitic lava?
No, basaltic lava is typically more fluid than andesitic lava due to its lower silica content. This results in basaltic lava flowing more easily and spreading over larger areas compared to andesitic lava.
Why is rhyolitic lava more expolsive than basaltic lava?
Rhyolitic lava is extremely viscous. This means it can hold more gas under pressure. The magma travels upward slowly until the gas, which has been held in place, comes out of solution pretty much all at one, resulting in an explosion. The high viscosity also means that the magma can build over time only to be released suddenly. Basaltic lava, which does not resist flow as much, can be extruded more gradually.
Does basilic lava have low silica?
Yes, basaltic lava has low silica content compared to other types of lava. Basaltic lava is typically rich in iron, magnesium, and calcium, which contribute to its low silica content. This low silica content also makes basaltic lava less viscous and more likely to flow easily.
Temperature differences between acidic and basaltic lava?
Acid lava comes from composite cone volcanoes, is slow moving and viscous. Basic lava comes from shield volcanoes, is runny and flows faster. Acidic lava is felsic, or high in quartz and potassium feldspars. Basic lava is mafic, and higher in plagioclase feldspar.
How dangerous is rhyolitic lava?
Rhyolitic lava is highly viscous and tends to flow slowly, allowing for greater control and less risk of widespread destruction compared to more fluid lavas like basaltic. However, rhyolitic eruptions can still produce explosive events due to the high gas content and pressure buildup within the magma. These explosions can generate pyroclastic flows, ash fall, and lahars, posing significant risks to nearby communities.
What Type of Lava usually flows out of oceanic volcanoes?
Oceanic volcanoes usually release basaltic lava. Basaltic lava is low in silica content, which makes it less viscous and allows it to flow easily and travel long distances before solidifying. This type of lava is common in underwater volcanic activity due to the melting of basaltic oceanic crust.
What type of eruptions do mafic magmas cause?
Basaltic magmas are associated with fissure eruptions creating lava flows spilling out from cracks in the crust. This is because basaltic magmas are more viscous and contain a lower concentration of gases than rhyolitic magma and therefore are unable to build up sufficient pressure to produce explosive eruptions.
