The highest viscosity lava is rhyolite. Rhyolitic lava tends to form dome-shaped volcanoes and tends to cause explosive eruptions.
Silica content is directly proportional to viscosity, so the higher the silica content of a lava, the higher its viscosity. high viscosity means a lava will be thick and slow moving, hence probably meaning an explosive eruption. lava's with a high viscosity include rhyolite and andesite whereas lava's with a low viscosity (runny ones) include basalt.
No. A cinder cone is formed from lower viscosity basaltic lava fountaining into the air. A lava dome is formed from high viscosity lava, usually rhyolite or dacite, erupting slowly.
Lava with high viscosity is called slica-rich lava
yes. lava can have high viscosity and also low viscosity. most of the time the viscosity level is high
A lava dome indicates lava with a very high viscosity. A low viscosity lava would flows away rather than build into a dome.
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.
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low viscosity lava due to the violent eruption of the volcano
Rhyolite forms when a volcano erupts lava or ash with a very high silica content.
no, it moves faster.
Andesitic lava is a kind of lava, referring to lava that forms andesite when it cools. It rated as intermediate on a scale of igneous compositions At one end are mafic lavas, which are poor in silica (giving them low viscosity) and contain significant amounts of iron, magnesium, and calcium to felsic and cool to form basalt. At the other end are felsic lavas, which are rich in silica (giving them very high viscosity) and contain significant amounts of sodium, potassium, and aluminum and cool to form rhyolite. Andesitic lava, due to its high viscosity does not look like the traditional concept of lava, which is based on the appearance of mafic lava.
No. Viscosity is a liquid's resistance to flow. So higher viscosity means a slower flow.
A complex volcano is likely to have a highly variable viscosity in its lava, ranging from low viscosity mafic material to high viscosity felsic material.
Lava has a rather high viscosity compared to most liquids.
No. Pillow lava is basaltic, low-viscosity lava. Krakatoa is a stratovolcano with a style of ereuption more characteristic of high-viscosity andesitic lava.
The lava in Mt. St Helen has high viscosity.
Viscosity effects lava by how high it is or how low it is. The high viscosity Thick sticky high silica magma don't erupt. Internal pressure rises. Violent eruptions occurs. Abundant pyroclasts. Low viscosity. Runny low silica high temperature. Basaltic lava, erupts easily produces quiet eruptions of free flowing lava. Differernt. Viscosity's of lava results in different kinds of volcanoes. Sorry about some of the words my computer doesn't spell correctly.
Viscosity means how runny it is. Thus a lava with low viscosity will erupt fast and form long, wide spreading lava flows (eg Hawaii) and lavas of high viscosity will erupt slowly and form lava domes (eg Mt. St. Helens).
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Rhyolite is an igneous rock that has formed from rapidly cooling lava or ash.
The viscosity of a cinder cone volcano is high i think.
A rhyolite volcano is a volcano that erupts rhyolitic lava or pyroclasitc material. Rhyolite is an igneous rock formed from the eruption of extremely viscous silica rich material. Eruptions involving rhyolite can be extremely large and violent. In some cases, however, rhyolite can build into lava domes or form thick, extremely slow lava flows.