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If the gas cannot escape, such as when the magma solidifies underground, then the gasses become part of the minerals within the igneous rock. Since the main gas in most magma is water vapor, this effect will manifest mostly as hydrous minerals such as amphibole and mica.
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What happens if gas cannot escape easily from magma?
If the gases separate rapidly and cannot escape immediately, they can build up pressure greater than that of the overlying rock. When this happens, they break the rock suddenly as a violent explosion occurs sending a plume of gas and ash upwards to heights as great as 20 miles. see related link (below)
What can cause the most explosive volcano?
If you get a very sticky magma (molten rock) which can occur due to the composition of the magma it makes it hard for gas to escape (e.g. think of blowing bubbles through honey and water, its harder through honey), when the gas does escape out of these sticky magma's it has built up a lot of pressure and explodes.
What gas is produced when hot magma rises?
Various gasses escape from magma. Water vapor is the most abundant, but other common gasses include carbon dioxide and sulfur dioxide.
When magma reaches the surface its dissolved gas content increases True or False?
False! The reduction in pressure causes the gasses to exsolve (come out of solution) and escape into the atmosphere, so the dissolved gas content of a magma reduces when it reaches the surface.
Why may a volcano that is about to erupt give off more gas?
Volcanoeproduce small earthquake the magma moves upward that happens because the magma moves/pushes on a rock that it rises
Why is silica rich magma explosive?
This is because silica-rich magma is thicker. The thicker the magma, the chance for the dissolved gas in there to escape is less likely. This causes an explosion. When the gases do escape, they cause an even bigger explosion
Do gases escape from magma?
Yes. This is because as the magma moves towards the Earth's surface it is under a lower pressure so is able to maintain lesser volumes of dissolved gas. As such the extra gas exsolves and escapes from the magma.
What happens if gas cannot escape easily from magma?
If the gases separate rapidly and cannot escape immediately, they can build up pressure greater than that of the overlying rock. When this happens, they break the rock suddenly as a violent explosion occurs sending a plume of gas and ash upwards to heights as great as 20 miles. see related link (below)
What kind of magma produce violent volcanoes eruptions?
Rhyolitic magma. This type of magma is found where the gases can't escape like in volcanic eruptions. Because the gas can not escape, the magma becomes viscous, resulting in the explosions being violent and unpredictable. The other type of magma is Basaltic magma. This can be found where continent plates are pulling away from each other and the magma is nearer the surface. This allows the gas to escape and therefore the magma is less viscous and doesn't result in explosive volcanoes, here eruptions are gentle and 'rifts' are more likely, where lava is persistent. I hope this helps! :)
What can cause the most explosive volcano?
If you get a very sticky magma (molten rock) which can occur due to the composition of the magma it makes it hard for gas to escape (e.g. think of blowing bubbles through honey and water, its harder through honey), when the gas does escape out of these sticky magma's it has built up a lot of pressure and explodes.
If you cut a hole in a basketball what happens to the gas insid?
It escapes.
What gas is produced when hot magma rises?
Various gasses escape from magma. Water vapor is the most abundant, but other common gasses include carbon dioxide and sulfur dioxide.
What happens if a gas pipe fractures?
The gas will escape, and if there is a spark, the gas will ignite.(I assume the gas (American) is not what we in Britain call petrol? )
When magma reaches the surface its dissolved gas content increases True or False?
False! The reduction in pressure causes the gasses to exsolve (come out of solution) and escape into the atmosphere, so the dissolved gas content of a magma reduces when it reaches the surface.
How does magma chamber differ from a vent?
A Magma Chamber is a space (that can change size) at a depth below a volcano in which magma can accumulate prior to an eruption. A volcanic vent is a conduit connecting the magma chamber to the surface. It is though this that the magma flows during an eruption.
Why may a volcano that is about to erupt give off more gas?
Volcanoeproduce small earthquake the magma moves upward that happens because the magma moves/pushes on a rock that it rises
What is a magma vent and how is it different from a gas vent?
A gas vent would be above the level of a liquid; it would allow gas to escape as the liquid rises or air to be drawn in as the liquid lowers in attempt to equalize gas and atmospheric pressure. A vent located below the liquid line would allow the liquid to escape as the liquid level in the enclosed area rises.
