On this page we look at why volcanoes are found at constructive plate boundaries. This has more to do on how are volcanoes formed by plate tectonics and on convergent boundaries.
How do Volcanos Form
According to One Geology, volcanos are normally formed when hot molten rock, ash and gases escape from an opening in the Earth’s surface. The molten rock and ash solidify as they cool, forming the distinctive volcano shape shown here.
Reason why are Volcanoes Found at Constructive Plate Boundaries
Using Iceland as an example – where tectonic plates are always moving away from each other, volcanos are always common. This is because the Earth’s crust is pulled apart to create a new pathway for rising hot magma to flow on to the surface.