How do you know when a volcano erupts?


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?"
Volcanoes erupt when rock inside the earth becomes so hot that it melts. The result is magma. Magma is lighter than rock and will rise around the rock. When it reaches the earths
1. Look for plumes of smoke or clouds of gas on or around the volcano that aren't typically there. As magma flows into the chambers beneath a volcano and rises to the surface, it
A volcano erupts when pressure on the magma chamber causes the magma to rise and come out together with gas, rocks and ashes. Violence of an eruption depends on how much pressure
Eruptions happen when Earth's surface ruptures, allowing hot, molten rock, ash, & gases to
1 Additional Answer 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
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When pressurized molten rock combines with heated gases, volcanoes erupt. The magma being less dense than the solid rock surrounding it produces eruption. You ...
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