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Why do some volcanoes erupt ash and others lava?
The style of the volcanic eruption is very dependent on the amount of dissolved gas that is in the magma (liquid rock below the surface). If there is a high gas content the volcanic eruption will be explosive and create a log of ash. If the gas content is low the eruption produces more lava flows. An example of a high gas content eruption was the last major eruption of Mt. St. Helens in 1980. An example of a low gas content eruption would be the Hawaiian volcanoes.
Is the lava from Mount Rainier high or low vicosity?
The lava from Mount Rainier tends to have higher viscosity due to its composition, which includes more silica and other dissolved gases. This higher viscosity can lead to the lava flowing more slowly and forming steeper volcanic features.
Which chemical affects lava what makes it flow or explode?
There are a few different components. The ability of lava to flow is largely affected by silica content. More silica means the lava flows less easily. The explosive potential comes from gass trapped in the molten rock, which is released violently upon exposure to lower pressure. The primary gas is water vapor. Magma that is high in silica usually has a high gas content.
What is the solid form of lava that is so frothy with gas when it reaches the surface?
Pumice is volcanic rock formed from frothy lava. It will usually float on water because of all the gas bubbles in it.
Does the composite volcano have high viscosity?
Composite volcanoes typically have higher viscosity lava compared to shield volcanoes, resulting in more explosive eruptions. The high silica content in the magma of composite volcanoes contributes to this higher viscosity. However, the exact viscosity of the lava can vary depending on specific factors such as temperature and gas content.
Does felsic lava create violent or quiet eruptions?
Felsic lava, due to its high viscosity and generally high gas content tends to produce violent eruptions.
Why do some volcanoes erupt ash and others lava?
The style of the volcanic eruption is very dependent on the amount of dissolved gas that is in the magma (liquid rock below the surface). If there is a high gas content the volcanic eruption will be explosive and create a log of ash. If the gas content is low the eruption produces more lava flows. An example of a high gas content eruption was the last major eruption of Mt. St. Helens in 1980. An example of a low gas content eruption would be the Hawaiian volcanoes.
Is the lava from Mount Rainier high or low vicosity?
The lava from Mount Rainier tends to have higher viscosity due to its composition, which includes more silica and other dissolved gases. This higher viscosity can lead to the lava flowing more slowly and forming steeper volcanic features.
Which chemical affects lava what makes it flow or explode?
There are a few different components. The ability of lava to flow is largely affected by silica content. More silica means the lava flows less easily. The explosive potential comes from gass trapped in the molten rock, which is released violently upon exposure to lower pressure. The primary gas is water vapor. Magma that is high in silica usually has a high gas content.
What is the solid form of lava that is so frothy with gas when it reaches the surface?
Pumice is volcanic rock formed from frothy lava. It will usually float on water because of all the gas bubbles in it.
What factors control the viscosity of magma and lava?
The three factors that control the viscosity of lava are temperature, composition and dissolved gases. When the temperature is hotter, there will be less viscous. When the composition has a higher silica content, there will be higher viscosity and a lower silica content means a lower viscosity. The gases will expand within the lava as it nears the surface of the Earth because of decreasing pressure.
Lava plateaus are likely to have formed from magma that is?
basaltic with little gas content
Does the composite volcano have high viscosity?
Composite volcanoes typically have higher viscosity lava compared to shield volcanoes, resulting in more explosive eruptions. The high silica content in the magma of composite volcanoes contributes to this higher viscosity. However, the exact viscosity of the lava can vary depending on specific factors such as temperature and gas content.
What will happen if the volcano has high vicosity magma but very low gas content?
The result will be a slow extrusion of lava which will either form a thick block lava flow or a lava dome. If the magma is too viscous it may fail to erupt and instead plug the volcano.
Why can lava be explosive or non explosive?
Lava can be explosive if it is high in gas content, such as dissolved water vapor or carbon dioxide, which can cause pressure to build up and lead to explosive eruptions. On the other hand, lava can be non-explosive if it is low in gas content and flows more easily without building up pressure, resulting in effusive eruptions with slower lava flows.
Does silica or water have the greater effect on the eruptive force of the volcano?
Water gas a greater influence. Regardless of the amount of silica present, an eruption cannot be explosive if there is no gas present, and the chief gas is water vapor. Magma that is high in silica but low in gas content will be slowly extruded to form a lava dome or a very thick lava flow.
What is the importance of a silica and oxygen in lava flow speed?
Silica and oxygen content in lava affects its viscosity, which in turn impacts flow speed. Lava with higher silica content tends to be more viscous and flows slower, while lava with lower silica content flows faster. The presence of oxygen also influences lava's ability to flow by affecting its gas content and pressure.
