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Volcano - Wikipedia


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. ...

USGS FAQs - Volcanoes General - How Do Volcanoes Erupt?


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 ...

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).

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


Jan 5, 2015 ... 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.

How do volcanoes erupt? | Reference.com


Volcanic eruptions can either be effusive or explosive. An effusive volcanic eruption occurs when the lava pours out onto the ground from the volcano's vent.

Why do volcanoes erupt? | Reference.com


Hot melted rocks collect under the Earth's surface and when the pressure becomes too hard, the Earth's skin breaks, and a volcano erupts. The melted rock  ...

How does a volcano erupt? | Reference.com


A volcano erupts through the build-up and release of pressure, whether that pressure is of its underlying magma, water or both. This release can be explosive , ...

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


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 ...

www.ask.com/youtube?q=How Does A Volcano Erupt&v=-kQwudeT3ww
Jun 29, 2013 ... A quick and fun cartoon lesson about volcanoes. ... All About Volcanoes: How They Form, Eruptions & More! ... Why Do Volcanoes Erupt?
www.ask.com/youtube?q=How Does A Volcano Erupt&v=6CBnqZkascs
May 15, 2015 ... Volcano eruption - Lava Volcano erupting - Hawaii volcano - Lava lake - Lava flow- 2015 Volcano eruption - Lava Volcano eruption - Hawaii ...
How Does a Volcano Erupt?
A volcano marks a vent where magma, or molten rock, reaches the Earth’s surface in the form of lava and associated materials. While many people envision a conical peak when they think of a volcano, a wide variety of landforms fall into the... More »
Difficulty: Easy
Source: www.ehow.com
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How Do Volcanoes Erupt? - Universe Today


May 26, 2016 ... Volcanic eruptions are driven by a combination of mechanisms, which include pressure and heat in the Earth's mantle, as well as tectonic ...

Why do volcanoes erupt? What creates eruptions? - eSchooltoday


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 ...

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 ...