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because

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Keely Brakus

Lvl 13
2y ago
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Wiki User

13y ago

the silica content affects the viscosity of the magma. an acidic rock (high silica content) will produce a more runny, less viscous magma, this type of magma has the ability to flow more easily and release pressure of a long period of time (Hawaii). whereas basic magmas contain more silica, this causes more viscous magma, which has the ability to build up pressure in a magma chamber until the pressure is too great and it has explosive characteristics, eg Mt St Helens. safe mate

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Arpi Matevosyan

Lvl 1
2y ago
thank you

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Wiki User

13y ago

The higher the silica content of the magma, the more viscous the magma.

The higher the viscosity of the magma, the more explosive the eruptions of the volcano tend to be.

Lower silica content lavas tend to form shield volcanoes (such as the type formed on Hawaii) where the lava can flow very long distances as it has a much lower viscosity.

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Wiki User

11y ago

Yes. Silica increases the viscosity of magma, and water is a volatile component, Both factors increase the chances of an eruption being explosive.

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Wiki User

12y ago

I know silica makes it harden faster, and is usually in exploding eruptions.

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Wiki User

13y ago

we

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Q: How are silica and water related to volcanos explosiveness?
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