Another type of formation of volcanoes is spreading center volcanism, which occurs at mid- ocean ridges. That is where two plates diverge away from each other, opening space between them. As the plates pull apart hot magma rises from the mantle forming magma chambers, where the magma will erupt to the surface from there. Also the high heat from mid-ocean ridges will form hydrothermal vents, which form from water seeing down and is heated from the rocks lying on the magma chamber. This hot water on surface contains lots of silica and numerous metals from lava. An example is the Iceland plume which was said to have seen the earliest volcanic rock about 56-60 million years ago.
Volcanoes can also be formed from Interplate (hotspot) Volcanism or Convection. These are active sites of volcanism within plate interiors, these hotspots are from hot mantle in a mantle plume which is generated in the lower mantle and