GEOLOGY

Detailed explanation-1: -At constructive plate boundaries, the tectonic plates are moving away from one another. The Earth’s crust is pulled apart to create a new pathway for rising hot magma to flow on to the surface. Volcanoes can sometimes form in these setting; one example is Iceland.

Detailed explanation-2: -Along plate boundaries, either plates sink below another plate (subduction), heating and creating magma, or plates pull apart, allowing magma to rise to the surface. In both these conditions, when the magma reaches the surface it creates volcanoes. Thus, most of the volcanoes are found on the plate boundaries.

Detailed explanation-3: -At a convergent plate boundary, when one plate is oceanic, there are large volcanoes. These volcanoes are found in lines that outline the subduction zone. Earthquakes also happen in these zones. Subduction of an oceanic plate beneath a continental plate forms a line of volcanoes known as a continental arc.

Detailed explanation-4: -They are generally found where tectonic plates come together or separate but they can also occur in the middle of plates due to volcanic hotspots.