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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)
Does basaltic magma have little gas?
Yes, basaltic magma typically has low gas content compared to other types of magma. This is because basaltic magma is formed at high temperatures and pressures which allows gases to escape more easily. The low gas content contributes to the relatively quiet and effusive eruptions common with basaltic magma.
An explosive eruption occurs if magma is?
An explosive eruption occurs if magma is high in gas content and viscosity. The high gas content creates pressure within the magma chamber, leading to a violent release of energy when the eruption occurs. The high viscosity of the magma makes it more difficult for gases to escape, further increasing the explosiveness of the eruption.
How do vesicles form in vesicular rocks?
Vesicles in vesicular rocks form when gases trapped within magma during a volcanic eruption are released as the magma solidifies. As the magma cools and solidifies, the gases are unable to escape, creating voids or cavities within the rock that we identify as vesicles. The size and shape of vesicles can vary depending on the gas content and cooling rate of the lava.
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.
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)
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 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! :)
How does the amount of dissolved gas affect the magma?
The amount of dissolved gas in magma can influence its viscosity and explosivity. Higher gas content can lead to more explosive eruptions as the gas expands and tries to escape. Lower gas content can result in less explosive lava flows.
Does basaltic magma have little gas?
Yes, basaltic magma typically has low gas content compared to other types of magma. This is because basaltic magma is formed at high temperatures and pressures which allows gases to escape more easily. The low gas content contributes to the relatively quiet and effusive eruptions common with basaltic magma.
An explosive eruption occurs if magma is?
An explosive eruption occurs if magma is high in gas content and viscosity. The high gas content creates pressure within the magma chamber, leading to a violent release of energy when the eruption occurs. The high viscosity of the magma makes it more difficult for gases to escape, further increasing the explosiveness of the eruption.
If you cut a hole in a basketball what happens to the gas insid?
It escapes.
How do vesicles form in vesicular rocks?
Vesicles in vesicular rocks form when gases trapped within magma during a volcanic eruption are released as the magma solidifies. As the magma cools and solidifies, the gases are unable to escape, creating voids or cavities within the rock that we identify as vesicles. The size and shape of vesicles can vary depending on the gas content and cooling rate of the lava.
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.
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.
