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Volcanoes are created from a opening in the Earth's crust, which allows hot magma, ash and gases to escape. They form in the shape of cones, domes or simple fissures.

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 .... Some volcanoes have rugged peaks formed by lava domes rather than a summit crater while others have landscape features such as massive ...

www.weatherwizkids.com/weather-volcano.htm

Volcanoes are formed when magma from within the Earth's upper mantle works its way to the surface. At the surface, it erupts to form lava flows and ash deposits  ...

www.csun.edu/~jao45194/volcano2.html

When a large body of magma has formed, it rises thorugh the denser rock layers toward Earth's surface. Magma that has reached the surface is called lava.

owlcation.com/stem/How-Does-a-Volcano-Form

Nov 3, 2016 ... Volcanoes are most commonly formed at the convergence or divergence of tectonic plates. For example in Mid-Ocean Ridges, where tectonic ...

www.familyonbikes.org/educate/lessons/volcanoes.htm

Most volcanoes are formed by the movement of tectonic plates on the surface of the earth. These plates are basically huge pieces of rock that 'float' on the ...

.ask.com/youtube?q=How+Are+Volcanoes+Formed&v=6Z4as_imJfM
Jun 22, 2011 ... How Volcanoes Form ... Volcanoes, Their Formation, Impact, & Eruption - Interesting & Educational Videos for Kids, Children - Duration: 14:48.

www.conserve-energy-future.com/howvolcanoesform.php

Shield volcanoes build up gradually for a long time, experiencing numerous eruptions and forming layers during the period. These kinds of volcanoes do not  ...

www.windows2universe.org/earth/interior/volcano_formation.html

Apr 29, 2016 ... Volcanoes form when hot material from below risesand leaks into the crust. This hot material, called magma, comes either from a melt of ...

science.howstuffworks.com/nature/natural-disasters/volcano2.htm

Magma can also push up under the middle of a lithosphere plate, though this is much less common than magma production around plate boundaries.