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Volcanoes erupt due to pressure that the weight of the rocks puts on the magma and forces it to the surface out any available vent or exit provided to it. The magma is in a reservo...

Several factors trigger volcanic eruptions, including the buoyancy of magma, a build-up of pressure from the gases in the magma and an injection of new magma into a full magma chamber.
When a part of the earth's upper mantle or lower crust melts, magma forms. A volcano is essentially an opening or a vent through which this magma and the dissolved gases it contains are discharged.



Erupting volcanoes can pose many hazards, not only in the immediate ... from the core-mantle boundary in a fixed space that causes large-volume melting.

What causes a volcano erupt?


A volcano begins as melted rock (magma) which rises from deep inside the earth toward the surface. As the gas-filled magma rises ...

Why are there volcanoes? Why do they erupt? | Volcano World ...


Volcanoes erupt because of density and pressure. The lower density of the magma relative to the surrounding rocks causes it to rise (like air bubbles in syrup).

What causes a volcano to erupt and how do scientists predict ...


Nov 29, 1999 ... When a part of the earth's upper mantle or lower crust melts, magma forms. A volcano is essentially an opening or a vent through which this ...

Why do volcanoes erupt? | Earth | EarthSky


Aug 20, 2015 ... It is increased magma movement within a volcano that causes an eruption. These movements are triggered by different processes that happen ...

What Causes Volcanoes? Why do Volcanoes Erupt? - WorldAtlas.com


May 13, 2015 ... In spring of 2015, they were featured in the news heavily, primarily in Chile, with two recently active sites of volcanic activity. Calbuco erupted ...

Volcanoes - Weather Wiz Kids weather information for kids


The friction causes earthquakes and volcanic eruptions near the edges of the plates. The theory that explains this process is called plate tectonics. Volcano

What causes Volcanoes? - Geoscience Australia


Where plates move away from each other at spreading or divergent plate margins, volcanic eruptions are gentle extrusions of basaltic lava. Most of these occur ...

Popular Q&A
Q: What makes a volcano erupt?
A: The magma, the pressure from the gases in the magma and the injection of a new batch of Read More »
Source: www.chacha.com
Q: What makes a volcano erupt?
A: Magma (hot molten rock) is less dense (lighter) than the solid rock and tends to want to move upward. When it reaches the surface, it erupts. Other factors such... Read More »
Source: answers.yahoo.com
Q: What Makes a Volcano Erupt?
A: Volcanic eruptions are dramatic geological events. They occur throughout the globe and their level of destruction varies. A volcano normally affects a localized... Read More »
Source: www.associatedcontent.com
Q: What makes a volcana erupt?
A: the bamabam face buttox sexy dede of the earths crust makes a volcano erupt. Read More »
Source: wiki.answers.com
Q: What makes a volcano erupt?
A: From Mount Vesuvius in Italy to Mount St. Helens in the U.S., volcanos have always been a thing of beauty to behold even though they are potentially one of the ... Read More »
Source: www.catalogs.com