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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.

Volcano

en.wikipedia.org/wiki/Volcano

Erupting volcanoes can pose many hazards, not only in the immediate vicinity .... they can produce violent, explosive eruptions, but their lava generally does not ...

What causes a volcano erupt?

www.vtaide.com/png/George/volcanoes.htm

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 ...

volcano.oregonstate.edu/why-are-there-volcanoes

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 ...

www.scientificamerican.com/article/what-causes-a-volcano-to/

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

earthsky.org/earth/why-do-volcanoes-erupt

Aug 20, 2015 ... Volcanoes are channels that transfer molten rock from Earth's crust to the ... A decrease in the density of covering rocks eventually makes them ...

Volcanoes - Weather Wiz Kids weather information for kids

www.weatherwizkids.com/weather-volcano.htm

An erupting volcano can trigger tsunamis, flash floods, earthquakes, mudflows and ... Lava domes are formed when erupting lava is too thick to flow and makes a ...

www.ask.com/youtube?q=What Makes A Volcano Erupt&v=-kQwudeT3ww
Jun 29, 2013 ... A quick and fun cartoon lesson about volcanoes. Great for teachers and students- hope you guys enjoy! Be sure to subscribe if you like it, there ...

What Makes A Volcano Erupt? - Catalogs.com

www.catalogs.com/info/earth-science/what-makes-a-volcano-erupt.html

There are few geological events that are as dramatic as a volcanic eruption except maybe a hurricane, tornado or a tsunami. Each is drama.

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 volcanoes erupt?
A: Explosive eruptions occur when thick magma and large amounts of gas build up under the surface. Ask us. report this answer. Updated on Wednesday, February 01 20... Read More »
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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