What is the boundary found where plates are moving apart at mid-ocean ridges and volcanoes form at places where plates move away from each other?
You may find volcanic islands like Iceland when moving apart from each other in the northern Atlantic Ocean or in case of strike-slip faults on top of hotspots archipelagos like the Canary Islands in front of the shelf of the African Continent. It is mostly Alkaline volcanic and subvolcanic rocks and pyrolastic deposits evolving from a submarine to a subaerial stage. They are mostly of modern geological ages from the Neogen to the Quaternary.
HGD
Plates move apart from each other along divergent boundaries. In the ocean basins these boundaries are the mid-ocean ridges, where new oceanic crust forms. Where continents are pulled apart, large gaps, or rift systems, develop. Divergent boundaries where two plates are moving apart. Divergent boundaries within continents initially produce rifts, which produce rift valleys. The most active divergent plate boundaries are between oceanic plates and are often called mid-oceanic ridges. 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. The 5 percent of known volcanoes in the world that are not closely related to plate margins are generally regarded as intraplate, or “hot-spot,” volcanoes. A hot spot is believed to be related to the rising of a deep-mantle plume, which is caused by very slow convection of highly viscous material in Earth's mantle. Volcanoes are one kind of feature that forms along convergent plate boundaries, where two tectonic plates collide and one moves beneath the other. A divergent boundary occurs when two tectonic plates move away from each other. Along these boundaries, earthquakes are common and magma (molten rock) rises from the Earth's mantle to the surface, solidifying to create new oceanic crust. The Mid-Atlantic Ridge is an example of divergent plate boundaries. Plates move apart from each other along divergent boundaries. In the ocean basins these boundaries are the mid-ocean ridges, where new oceanic crust forms. Where continents are pulled apart, large gaps, or rift systems, develop. A divergent boundary occurs when two tectonic plates move away from each other. Along these boundaries, earthquakes are common and magma (molten rock) rises from the Earth's mantle to the surface, solidifying to create new oceanic crust. If two tectonic plates collide, they form a convergent plate boundary. Usually, one of the converging plates will move beneath the other, a process known as subduction. Deep trenches are features often formed where tectonic plates are being subducted and earthquakes are common at subduction zones as well. At a convergent plate boundary, one plate dives or “subducts” beneath the other, resulting in a variety of earthquakes and a line of volcanoes on the overriding plate. A convergent plate boundary also known as a destructive plate boundary , usually involves an oceanic plate and a continental plate. The plates move towards one another and this movement can cause earthquakes and volcanoes. As the plates collide, the oceanic plate is forced beneath the continental plate.
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