How do colliding boundaries form volcanoes?

Answer 1

Volcanoes are usually found where tectonic plates are diverging (pulling apart) or converging (coming together). A mid-oceanic ridge (Mid-Atlantic Ridge) has examples of volcanoes caused by divergent tectonic plates that are pulling apart. The Pacific Ring of Fire has examples of volcanoes caused by convergent tectonic plates that are coming together.

Answer 2

In convergences between two oceanic plates OR between an oceanic and a continental plate, the more dense plate subducts under the less dense plate and moves toward the mantle. As the geothermal gradient increases with depth, the subducting plate is exposed to higher and higher temperatures. The oceanic crust undergoes partial melting from exposure to these increased temperatures, and due to the presence of water in the subducting plate. Lithostatic pressure,and the low density of the magma cause it to rise toward the surface. Some magma may solidify underground before reaching the surface; some magma, however, finds its way to the surface, and produces a volcano.

Answer 3

The colliding boundaries are the tectonic plates of the earth moving toward one another. Thier interaction is a "crumbling effect", over many, many years sending the matter of the earth upward, creating in some cases "mountain ranges" and an opportunity for the great pressure of steam, melted earth, rock (lava) to escape. Sometimes the pressure becomes so great the mountain "blows it's top", realeasing violently the steam, ash, lava, and sends the matter of the earth up into the sky. That would be an eruption of the volcano.

Answer 4

It doesnt. There is no way for magma to get up to the surface in a transform boundary