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Why rhyolitic and andesitic magmas associated with more explosive eruptions?
Wiki User
∙ 14y ago
Andesitic magma is more viscous and generally has more gas trapped in it. It is this the expansion of this gas under reduced pressure that drives the explosive force of an eruption. More gas means a more violent explosion.
Wiki User
∙ 9y ago
Wiki User
∙ 13y agoThe more silica content in the magma, the more viscous (thicker) the magma is. Thick magma rich in silica flows less easily than more thinner mafic (Basaltic-rich in Iron and magnesium) magmas
Dissolved gases in thick felsic lava will build up more pressure causing larger, more explosive eruptions
Wiki User
∙ 14y agoBecause they just are. so dont underestimate the power of nature
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What type of lava does mauna loa have felsic-rhyolitic intermediate-andesitic mafic-basaltic?
Mauna Loa exhibits non-explosive eruptions (like many in the Hawaiian islands) in the form of low viscosity (more fluid) lava due to poor silica content.
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.
Are geological features created by rhyolitic magma Rhyolitic magma promotes eruptions?
Lava domes are large geological features created by rhyolitic magma. Rhyolitic magma promotes plinian eruptions. Plinian eruptions can happen very quickly and shoot lave several miles into the air.
What are 3 kinds of magma?
Basaltic lava, Andesitic lava, and Rhyolitic Lava :] (glad to help)
How the composition of magma determines an eruption's characteristics?
Silica(te) rich magma is usually an explosive eruption. The explosiveness of an eruption depends on - a) Gases trapped within the magma at eruption b) The Silica content c) The fragility of the crater walls and/or the volcanic plug.
Is pumice andesitic?
Not necessarily. Pumice can be andesitic, but it may be rhyolitic or dacitic.
What type of lava does mauna loa have felsic-rhyolitic intermediate-andesitic mafic-basaltic?
Mauna Loa exhibits non-explosive eruptions (like many in the Hawaiian islands) in the form of low viscosity (more fluid) lava due to poor silica content.
What is Magma that is high in silica and produces explosive eruption is called?
Rhyolitic magma. Boom! Basaltic magma is its exact opposite, while andesitic magma is in between the two.
What are three different types of lava?
Basaltic, andesitic and rhyolitic
Is pumice a foidolite rock?
Not necessarily. It is often andesitic or rhyolitic.
What is a pumice source?
Pumice is produced in the lava from certain volcanic eruptions. It forms from gas-rich andesitic or rhyolitic lava and has so many gas bubbles that some pumice can float on water.
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.
Are geological features created by rhyolitic magma Rhyolitic magma promotes eruptions?
Lava domes are large geological features created by rhyolitic magma. Rhyolitic magma promotes plinian eruptions. Plinian eruptions can happen very quickly and shoot lave several miles into the air.
What are 3 kinds of magma?
Basaltic lava, Andesitic lava, and Rhyolitic Lava :] (glad to help)
Are magmas classified as intrusive and extrusive?
False there classified as basaltic, andesitic and rhyolitic based on amount of silica.
What list places the magma What list places the magma types in order of decreasing?
basaltic,andesitic,rhyolitic
How do basaltic rhyolitic and andesitic magmas differ?
The difference between basalt lava and andesite lava is the chemical composition. Basalt lava comes from deep in the mantle of the Earth. Andesite's come from shallow sources near the continental plate margin.
