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Volcano

en.wikipedia.org/wiki/Volcano

A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava ... Erupting volcanoes can pose many hazards, not only in the immediate vicinity of the eruption. ...

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 ...

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 ...

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 ...

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 ...

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

www.worldatlas.com/articles/what-causes-volcanoes-why-do-volcanoes-erupt-where-are-volcanoes-found.html

May 13, 2015 ... A volcanic eruption with lava flowing down the side of the mountain. ... Lava (the name for magma once it's out of the Earth), and gas does not ...

Volcanoes and volcanic eruptions - BBC

www.bbc.co.uk/schools/gcsebitesize/geography/natural_hazards/volcanoes_rev1.shtml

A secondary school revision resource for GCSE Geography covering key facts about volcanoes and volcanic eruptions.

How It Happens | Volcanic Eruptions - Video - NYTimes.com

www.nytimes.com/video/science/100000003431211/how-it-happens-volcanic-eruptions.html

The eruption of a volcano can be one of the planet's most destructive events — spewing huge amounts of rock, gas and ash that can kill people. Henry Fountain  ...

11.26.2003 - What makes volcanoes explode? It's the bubbles

www.berkeley.edu/news/media/releases/2003/11/26_bubbles.shtml

Nov 26, 2003 ... "One of the central problems of volcanoes is: Why do they erupt and why ... At the same time, the loss of dissolved gases makes it more difficult ...

Why do volcanoes erupt? What creates eruptions? - eSchooltoday

eschooltoday.com/volcanoes/how-do-volcanoes-erupt.html

Find out what the earth make-up is, and how extreme pressure build up inside the earth forces molten matter to be expelled out to the surface, causing a volcanic ...

Answer
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.
More Info

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

volcano.oregonstate.edu

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).

USGS FAQs - Volcanoes General - How Do Volcanoes Erupt?

www2.usgs.gov

Some volcanic eruptions are explosive and other are not. How explosive an eruption is depends on how runny or sticky the magma is. If magma is thin and ...

How Volcanoes Erupt - Universe Today

www.universetoday.com

May 20, 2009 ... Although volcanoes can look different, they're all created because of the same event; magma from beneath the Earth reaches the surface and ...