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When the magma gets close to the surface, the gases dissolved in it start to come out, forming gases which help the magma rise further and erupt. If there is a lot of gas in the magma, it may explode as the gases expand. There may also be triggers like a landslide that uncaps the magma reservoir (like at Mt. St. Helens in 1980) or an interaction with groundwater that causes an explosion.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoThey first give off warning signs.
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The magma moves into this place that is called (here at least) a waiting chamber. Here, it gives off gasses, volcanos also cause quick earthquakes or vibrations.
Magma gathering in a chamber causes slight swelling of the volcano's slopes. Gases released near the volcano can be measured for changes or in quantity.
Hope you got all that ^_^
Wiki User
∙ 14y agomagma crawls from underground to an opening in the volcano
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What happens to the layers of the crust when a volcano erupts?
They burst open
Describe what happens when a volcano erupts?
What do you see before a volcano erupts?
Whatever your looking at at the time....
Before magma erupts it collects under a volcano in a?
Chamber
When magma from beneath the Earths surface erupts as a volcano what happens?
which are the following?
What happens as a volcano erupts?
destruction
What happens if a volcano never erupts?
dormant
What happens to the people after a volcano erupts?
THEY die of course!
What happens to the layers of the crust when a volcano erupts?
They burst open
Describe what happens when a volcano erupts?
Can you predict when a volcano erupts?
precdiction about the story before
What happens as magma from beneath the earths surface erupts as a volcano?
which are the following?
What do you see before a volcano erupts?
Whatever your looking at at the time....
Before magma erupts it collects under a volcano in a?
Chamber
When magma from beneath the Earths surface erupts as a volcano what happens?
which are the following?
Where to go if a volcano erupts?
Type your answer here... were do you go when a volcano erupts
What hapens before a volcano erupts?
Eruptions are usually preceded by earthquakes
