What Happens before a Volcano Erupts?

Answer

In almost all volcanic eruptions, earthquakes occur first. During the earthquake, earth planes slide over one another creating pressure in the earth's inner core. This core builds up pressure around the volcano leading to magma formation and eventual eruption over the earth's surface.
Q&A Related to "What Happens before a Volcano Erupts"
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
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Some volcanoes erupt quietly; others violently shoot gas, steam and ash into the air. After a volcano erupts, gases are released into the atmosphere. These gases include water vapor
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Events that may precede an eruption are: increased seismicity (in particular, a harmonic tremor on a seismograph means magma is moving) ground deformation from magma rising, increased
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The shaking that occurs when a volcano begins to erupt is caused by...
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1 Additional Answer
Before a volcanic eruption, seismographs will monitor and register increased seismic activity in the area, geologists will notice a deformation in the dome and cone of the volcano and gas emissions may also occur.
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