Underwater volcanoes erupting can cause the magma to rise above the seafloor therefor hardening and eventually creating islands. Upon this factor, you might know that another word for an oceanic island is a volcanic island, this is important to remember so that when you see a question like this one you will automatically know the answer without having to checkback.
The natural factor that is most likely to support the formation of an oceanic island is the rise of magma from the seafloor. Oceanic islands are also otherwise known as volcanic islands. When volcanoes erupt, they create layers of lava that break the surface of the water. When the tops of the volcanoes emerge, an island is created.<span> </span>
