It produces a quiet eruption.
Rhyolitic magma. Boom! Basaltic magma is its exact opposite, while andesitic magma is in between the two.
The high the silica content, the explosive and the eruption.
If the composition of the magma is high in silica, the eruption will be explosive. The Eruption of Mt. St. Helens was an explosive eruption. If the composition of the magma is low in silica, it will produce a quiet eruption. The eruption(s) of Mt. Kilauea are quiet eruptions.
Acidic lava is very viscous, and thus will harden and block the vent. The magma will force its way out through the vent and create a violent explosion.
If an eruption is quiet, it typically indicates that the magma has low viscosity due to high silica content. The high silica content causes the magma to be more fluid, allowing gases to escape easily and resulting in a gentle eruption with less explosive activity.
If a volcano's magma is high in silica, the volcano will probably erupt explosively. If the magma is not high in silica, the volcano will probably erupt quietly.
If the composition of the magma is high in silica, the eruption will be explosive. The Eruption of Mt. St. Helens was an explosive eruption. If the composition of the magma is low in silica, it will produce a quiet eruption. The eruption(s) of Mt. Kilauea are quiet eruptions.
The properties of magma that help to determine the type of eruption are the magma's viscosity and its silica content. Those volcanoes that exhibit massive eruptions have a high viscosity and high silica content.
An eruption with thin, runny magma containing very little silica is called an effusive eruption. This type of eruption usually results in lava flows that can travel long distances from the volcano.
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A type of eruption that produces a viscous magma with 53 percent silica and a gas content of 2 percent is typically associated with a stratovolcano or a composite volcano. These eruptions are explosive due to the high viscosity of the magma, leading to the buildup of gas pressure before an explosive release. Example volcanoes with this type of eruption style include Mount St. Helens in the United States and Mount Pinatubo in the Philippines.
felsic magma, which has high viscosity due to its high silica content. This high viscosity can lead to the build-up of pressure and gas bubbles, resulting in explosive eruptions.