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Volcanoes are named after the lava that comes out.viscous volcanoes (or acid and dome) are the same thing.the lava comes to the surface close to subduction zones,which are found at convergent plate boundaries.it is high in silica content and does not flow easily.it contains gas which cannot escape easily,so eruptions may be explosive and violent.eg Caribbean volcanoes
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Does a composite volcano have an Aa type of lava?
A'a can occur at composite volcanoes, but block lava flows, which are far more viscous, are more common.
Composite volcanoes such as Mount Rainier in Washington are formed from what type of lava?
Composite volcanoes are primarily formed from andesitic lava, which is thicker and more viscous than basaltic lava. This leads to a build-up of pressure and explosive eruptions, creating the classic cone shape of composite volcanoes.
Is composite volcano lava viscous or fluid?
Composite volcanoes typically erupt with lava that is more viscous, meaning it is thicker and flows more slowly compared to lava from shield volcanoes. This viscosity can lead to more explosive eruptions as gas bubbles are trapped in the magma, causing pressure to build up until it is released in a violent eruption.
What is the consistency of lava in the composite volcanoes?
Composite volcanoes are found on destructive plate margins , where the oceanic crust sinks beneath the continental crust. Composite volcanoes have the following characteristics: Acidic lava, which is very viscous (sticky). Steep sides as the lava doesn't flow very far before it solidifies
What are the difference between acid lava and basic lava?
Acid lava comes from composite cones,is slowly moving and viscous while basic lava comes from shield volcanoes,is non viscous, runny and flows faster
Does a composite volcano have an Aa type of lava?
A'a can occur at composite volcanoes, but block lava flows, which are far more viscous, are more common.
Composite volcanoes such as Mount Rainier in Washington are formed from what type of lava?
Composite volcanoes are primarily formed from andesitic lava, which is thicker and more viscous than basaltic lava. This leads to a build-up of pressure and explosive eruptions, creating the classic cone shape of composite volcanoes.
Is composite volcano lava viscous or fluid?
Composite volcanoes typically erupt with lava that is more viscous, meaning it is thicker and flows more slowly compared to lava from shield volcanoes. This viscosity can lead to more explosive eruptions as gas bubbles are trapped in the magma, causing pressure to build up until it is released in a violent eruption.
What is the consistency of lava in the composite volcanoes?
Composite volcanoes are found on destructive plate margins , where the oceanic crust sinks beneath the continental crust. Composite volcanoes have the following characteristics: Acidic lava, which is very viscous (sticky). Steep sides as the lava doesn't flow very far before it solidifies
What are the difference between acid lava and basic lava?
Acid lava comes from composite cones,is slowly moving and viscous while basic lava comes from shield volcanoes,is non viscous, runny and flows faster
Did AA lava form composite volcanoes?
No, composite volcanoes are typically formed from explosive eruptions caused by viscous lava containing high amounts of silica. A'a lava, on the other hand, is characterized by its rough and blocky texture and typically forms shield volcanoes or cinder cones.
What is the type of lava in the composite volcanoes?
Composite volcanoes typically erupt with a mixture of lava types, including both viscous lava (andesitic or rhyolitic) that can lead to explosive eruptions, as well as more fluid lava (basaltic) that can flow long distances. This combination of lava types is what gives composite volcanoes their steep-sided profile.
Do composite cone volcanoes have mafic lava?
They can. Composite volcanoes vary in what they erupt. Many composite volcanoes are composed of a mixture of mafic, felsic, and intermediate rock. However, in most cases intermediated or felsic rock predominates.
Why does the lava from composite volcanos harden quickly?
Lava from composite volcanoes, or stratovolcanoes, is typically more viscous due to its higher silica content compared to basaltic lava from shield volcanoes. This increased viscosity means that the lava flows more slowly and doesn't travel far, allowing it to cool and solidify more quickly upon exposure to the atmosphere. Additionally, the steep slopes of composite volcanoes promote rapid cooling as the lava encounters cooler air and surface temperatures.
What forms from lava that is higher in water and silica content than lava that forms shield volcanoes?
Lava that is higher in water and silica content tends to be more viscous and can lead to explosive eruptions. This type of lava forms stratovolcanoes, also known as composite volcanoes, which are characterized by steep slopes and alternating layers of lava flows, ash, and volcanic rocks. Examples include Mount St. Helens and Mount Fuji.
What kind of lava do Composite Volcanoes have?
Composite volcanoes, also known as stratovolcanoes, typically have more viscous lava compared to shield volcanoes. This lava is comprised of a mixture of gas-rich, acidic magma and silica, which makes it thicker and more prone to explosive eruptions.
What are all kinds of volcanoes?
The main types of volcanoes are stratovolcanoes (composite volcanoes), shield volcanoes, cinder cone volcanoes, and lava dome volcanoes. Stratovolcanoes have steep slopes due to the alternating layers of lava flows, ash, and other volcanic debris. Shield volcanoes have gentle slopes due to the low-viscosity lava flows. Cinder cone volcanoes are small and steep-sided, formed from explosive eruptions. Lava dome volcanoes are formed from slow, viscous lava flows piling up near the vent.
