Have you ever seen a volcano up close and personal?  The rupture in the crust allows hot lava,ash, and gases to escape 
No only in pics or on tv but they are amazing
Volcanoes occur because the crust is broken into 17 major tectonic plates and they float on a hotter, softer layer  so there is movement.  
They are so massive and dangerous, really scary when you thing about it
I would actually love to be able to see the one in Hawaii, it's actually a hotspot also and it's postulated that the lava there is coming from the core-mantle boundary 3000km deep
Yeah didn't it just go through an active phase recently and ruin a couple of towns?
Yes, I think a lot of people lost their homes, etc.. they have four active volcanoes there and I think just one is erupting right now.
I would be terrified to live on an island with a volcano, no easy way to leave
ridge, such as the Mid-Atlantic Ridge, has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes can also form where there is stretching and thinning of the crust's plates, e.g., in the East African Rift and the Wells Gray-Clearwater volcanic field and Rio Grande Rift in North America. This type of volcanism falls under the umbrella of "plate hypothesis" volcanism. Volcanism away from plate boundaries has also been explained as mantle plumes. These so
Volcano
A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface.
Earth's volcanoes occur because its crust is broken into 17 major, rigid tectonic plates that float on a hotter, softer layer in its mantle. Therefore, on Earth, volcanoes are generally found where tectonic plates are diverging or converging, and most are found underwater. For example, a mid-oceanic