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"
magma crawls from underground to an opening in the volcano.
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There are three classifications of volcanoes. Extinct volcanoes are those which scientists believe will not erupt again. Dormant volcanoes aren't active but volcanologists believe
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it runs dowm the side and forms rock
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steps to a volcano. 1. an intense rumbling activates or awakens the volcono. 2. eventually the volcano will start to shake or rumble. 3. ash and molten rock will start to billow out
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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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