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Explain how the presence of silica and water in magma increases the chances of an explosive eruption?
Wiki User
∙ 11y ago
The higher the silica content of the magma, the more explosive the eruption. Magma enriched in silica has a higher viscosity (resistance to flow). Pressures are more likely to build up behind the thicker, high silica content magma and result in potentially more explosive eruptions.
Wiki User
∙ 13y ago
Wiki User
∙ 11y agoWater is a volatile component of magma, meaning normally it would vaporize at the temperatures found in magma, but is kept dissolved in it because of the extremely high pressure. As the magma inside a volcano nears the surface the pressure decreases and volatiles such as come out of solution, forming bubbles. If enough volatiles are present this bubbling can occur very rapidly, resulting in an explosion.
Silica makes magma more viscous, meaning it increases the magma's resistance to flow. More viscous magma can hold more volatiles. The high viscosity also keeps volatiles trapped in the magma, preventing them from escaping ahead of it until pressure is low enough for these gasses to come out of solution all at once, resulting in an explosion.
Wiki User
∙ 13y agoThe high the silica content, the explosive and the eruption.
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