The more silica crystal within the magma, the more viscous the magma is, because of crystals sticking together.
So magma with low silica content is runny, and wiht just flow gently out of a volcano, like in hawai, but viscous (sticky, like honey) magma will not, and gas gets trapped within it, and then explodes out, cause large scale explosive erruptions.
Lava from volcanoes will often contain silica. Lava with a high amount of silica flows slowly and will produce a volcano with sloping sides. Lava with a low content of silica flows quickly and spread great distances to form plateaus.
A low amount of silica will create a runny kind of lava found in shield volcanoes. That kind of lava is called Pahoehoe. A high amount of silica will make a thick kind of lava that is found in cinder cone volcanoes. That kind of lava is called Aa.
Silica content has an effect on the viscosity of the magma. A high silica content creates a more viscous magma. High viscosity magmas create explosive volcanoes such as cinder cones while low viscosity magmas create non-explosive volcanoes such as shield volcanos.
The silica contents of magma is largely responsible for the lava's viscosity, which determines whether the lava is erupted mildly or explosively.
the less silica there is the runnier the lava and the smaller the volcano is (visa versa)
It gives it violent or gentle eruptions.
Lava with high silica content will erupt explosively, if it has low silica content it will flow.
No. Shield volcanoes form from basaltic lava with a low silica content and a low water content.
no. AA has a relatively low silica content level.
Kilauea erupts low-silica lava.
No, shield volcanoes are characterized by lava with a low silica content. Consequently, the principal hazard of the volcano is the lava flow rather than the eruption itself.
Lava with high silica content will erupt explosively, if it has low silica content it will flow.
No. Pillow lava is basaltic, so it has a low silica content.
If lava contains quartz that means the silica content is high. A high silica content makes lava more viscous, and gives it the tendency to erupt explosively.
No. Shield volcanoes form from basaltic lava with a low silica content and a low water content.
A'a lava has a generally low silica content. Having low silica content means that it also has a low viscosity level. Having a low viscosity level means that it flows easily.
no. AA has a relatively low silica content level.
Kilauea erupts low-silica lava.
No, shield volcanoes are characterized by lava with a low silica content. Consequently, the principal hazard of the volcano is the lava flow rather than the eruption itself.
It has a low silica content.
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.
In rocks lava with a high silica content the silica starts to form a covalent network, where the silicate groups continously bond together.
I can't say exactly how much silica a'a has but it generally has a low silica content. Does this help