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.
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.
Q&A Related to "What Happens before a Volcano Erupts"
Before a volcano erupts, there are usually earthquakes that occur. Smoke will come up out of the top of the volcano, too. It is an awesome sight to see!
http://answers.ask.com/Science/Nature/what_happens...
magma crawls from underground to an opening in the volcano.
http://wiki.answers.com/Q/What_happens_before_a_vo...
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
http://www.ehow.com/how-does_4926308_what-happens-...
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
http://answers.yahoo.com/question/index?qid=200909...
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