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.
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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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