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Lava can be classified into two main types: mafic lava, which is rich in magnesium and iron and tends to flow easily, creating broad shield volcanoes, and felsic lava, which is high in silica and more viscous, leading to explosive eruptions and the formation of stratovolcanoes.
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Do shield volcanoes contain mafic or felsic lava?
Yes. Many stratovolcanoes vary in the composition of what they erupt over time. They may cycle in the type of material. As the magma chamber cools, the magma somtimes becomes more felsic only to periodically receive and injection of fresh mafic magma from the mantle.
Does magma having a silica content of 50 percent is more mafic than one having a silica content of 70 percent?
No, magma with a silica content of 50 percent is more felsic, while magma with a silica content of 70 percent is more mafic. Silica content is inversely proportional to magma's mafic or felsic classification.
Is lava heterogeneous?
Yes, lava is considered heterogeneous because it is a mixture of molten rock, gases, and various solid particles such as crystals and volcanic glass. This mixture creates different zones of composition and texture within the molten rock.
What do they call volcano formed by liquid rock?
There are two types of volcanoes formed by liquid rock (lava/magma), one being a shield volcano that are spread out over a large area but are not very tall because of the lava being mafic in nature (very liquid lava) such as the types of volcanoes that formed Hawaii, and the other being a composite volcano which is formed by felsic (thick) lava, making them steep and tall.
Are there three types of lava or four?
It depends on what criteria you use. If you go with the kind of flow there are four.Pahoehoe (ropey lava flows)A'a (jagged, more viscous flows)Pillow lava (rounded lumps that form underwater)Block lava (very viscous, very slow moving)The first three are all associated with mafic lava, also called basaltic lava, which refers to a specific composition. Pillow lava is sometimes ignored as are black lava flows, which don't much resemble traditional images of lava.In terms of composition there are also 4 basic types on a spectrum of increasing silica content and viscosityMafic (basaltic)Intermediate (andesitic)Intermediate-felsic (dacitic)Felsic (rhyolitic)These can be further subdivided. Another, rare kind of lava exists called carbonatite. This strange lava is composed of carbobnates rather than silicates as the others are, and is only found in one volcano: Ol Doinyo Lengai in Tanzania.
Do shield volcanoes contain mafic or felsic lava?
Yes. Many stratovolcanoes vary in the composition of what they erupt over time. They may cycle in the type of material. As the magma chamber cools, the magma somtimes becomes more felsic only to periodically receive and injection of fresh mafic magma from the mantle.
What is the lithosphere made of mafic or felsic?
Its made up of both. Oceanic crust is mostly mafic magma (basalt) and continental crust is mafic and felsic. The lithosphere also contains the upper portion of the upper mantle which is mostly mafic. The earths crust is 60% Si02 (silicates). Felsic rocks are much more silicate heavy than mafic. So one would assume that the crust is more felsic than mafic. That's just my conceptual thought process so don't take me on my word. Then again, the lithosphere also contains the upper mantle which is heavily mafic. So maybe the lithosphere in total is more mafic? Basically just typing thoughts down as they enter my brain. Answer I know for certain- Lithosphere is mafic and felsic.
Does magma having a silica content of 50 percent is more mafic than one having a silica content of 70 percent?
No, magma with a silica content of 50 percent is more felsic, while magma with a silica content of 70 percent is more mafic. Silica content is inversely proportional to magma's mafic or felsic classification.
Is lava heterogeneous?
Yes, lava is considered heterogeneous because it is a mixture of molten rock, gases, and various solid particles such as crystals and volcanic glass. This mixture creates different zones of composition and texture within the molten rock.
What do they call volcano formed by liquid rock?
There are two types of volcanoes formed by liquid rock (lava/magma), one being a shield volcano that are spread out over a large area but are not very tall because of the lava being mafic in nature (very liquid lava) such as the types of volcanoes that formed Hawaii, and the other being a composite volcano which is formed by felsic (thick) lava, making them steep and tall.
What is the odd one out of granite basalt sandstone?
Sandstone is the odd one out as it is a sedimentary rock, as opposed to granite and basalt which are respectively felsic and mafic igneous rocks.
Are there three types of lava or four?
It depends on what criteria you use. If you go with the kind of flow there are four.Pahoehoe (ropey lava flows)A'a (jagged, more viscous flows)Pillow lava (rounded lumps that form underwater)Block lava (very viscous, very slow moving)The first three are all associated with mafic lava, also called basaltic lava, which refers to a specific composition. Pillow lava is sometimes ignored as are black lava flows, which don't much resemble traditional images of lava.In terms of composition there are also 4 basic types on a spectrum of increasing silica content and viscosityMafic (basaltic)Intermediate (andesitic)Intermediate-felsic (dacitic)Felsic (rhyolitic)These can be further subdivided. Another, rare kind of lava exists called carbonatite. This strange lava is composed of carbobnates rather than silicates as the others are, and is only found in one volcano: Ol Doinyo Lengai in Tanzania.
Why is Felsic magma explosive?
Felsic magma tends to have large amounts of gas, chiefly water vapor, carbon dioxide, and sulfur dioxide, trapped in it under pressure. When it gets near the surface the pressure drops. The gas is released and expands rapidly, creating an explosion. The effect is similar to opening a freshly shaken can of soda, only much more violent.
Why is there no quartz formed in magma after it has cooled?
If you can't see its crystals without a microscope it's because the rock solidified too rapidly for visible crystals to form. Whether or not quartz is found in cooled magma/lava is basically a product of the chemical makeup of the molten rock. Quartz is the predominate silicate mineral in felsic igneous rocks, but may be non-existent in mafic igneous rocks. If you are referring to the fact that most felsic igneous rocks containing quartz do not exhibit well formed quartz crystals, it is because quartz is one of the last minerals to crystallize from magma, and solidifies in the voids between other minerals that have already crystallized.
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.
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.
Difference between viscous and non viscous lava?
Viscous lava is very sticky and thick and is more felsic (ie it contains more silica) than non-viscous lava. This type of lava makes for a very explosive volcano, because it's so sticky that it sticks to itself and can't exit the volcano until it explodes violently. Non-viscous lava is more runny and is more mafic (has more iron, less silica). Volcanoes with non-viscous lava are less explosive because the lava just runs out slowly and no pressure builds. The Hawaiian islands are formed from volcanoes with non-viscous lava.
