How do you know when a volcano erupts?

Answer

According to the UCSB Geology Department, a volcanic eruption is defined as a volcanic event resulting in the emission of gases, lava, ash or other material from a volcano. These can manifest as a single eruptive pulse, an eruptive phase or an eruptive episode.

Eruptive pulses are a one-time emission, lasting a few seconds to a few minutes. Eruptive phases are eruptions that continue for a few hours or days, switching between ash and lava expulsion. Eruptive episodes are several connected eruptive phases over the course of several days, months or years. In a single eruption, the style, strength and ejected material may change hour by hour.

Q&A Related to "How do you know when a volcano erupts?"
The volcano science project is a classic that has been recreated each generation. The student typically builds a papier mâché model of a volcanic mountain. The student
http://www.ehow.com/how-does_4910765_what-causes-v...
Very broad question! Basically when a plate gets subducted under another the rock turns to molten rock and consequently becomes less dense. As the material is less dense it rises
http://www.quora.com/Why-do-volcanoes-erupt
when to plate move away from each other a volcano forms. that causes a volcano to change wich changes land and continets and volcanos when a plate changes a volcanoe forms. wich volcanos
http://wiki.answers.com/Q/What_creates_the_volcano...
it erupt because plates move apart and the magma in the core comes to the vent.
http://wiki.answers.com/Q/What_causes_the_Sakuraji...
1 Additional Answer
Ask.com Answer for: how a volcano erupts
How to Make a Volcano Erupt
A volcano model made of dough or clay that erupts with a mixture of vinegar and baking soda is a entertaining and educational science activity for kids. Even preschool-age children love to watch the erupting "lava" bubbling out of the volcano's top. The... More »
Difficulty: Moderate
Source: www.ehow.com
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