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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 ...

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

How Volcanoes Erupt - Universe Today

www.universetoday.com/31124/how-volcanoes-erupt/

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 ...

USGS FAQs - Volcanoes General - How Do Volcanoes Erupt?

www2.usgs.gov/faq/categories/9819/2729

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 ...

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  ...

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.

Facts about Volcanoes for Kids - Primary Homework Help

www.primaryhomeworkhelp.co.uk/mountains/volcanoes.htm

What is a Volcano? A volcano is a landform (usually a mountain) where molten rock erupts through the surface of the planet. In simple terms a volcano is a ...

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.
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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).

Volcanoes - Weather Wiz Kids weather information for kids

www.weatherwizkids.com

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 A Volcanic Eruption? | IFLScience

www.iflscience.com

Jan 6, 2016 ... A team of volcanologists led by the University of Liverpool have released a perhaps controversial Nature study on the causes of volcanic ...