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It could be called an undersea island or submarisle.
Volcanic island arc
The island is referred to by locals as the Big Island. The island is called Hawaii and is the most recently formed island on the chain.
The island in Crater, called Wizard Island was formed by small volcanic eruptions that occurred after the Crater Lake caldera formed but before the volcano went extinct.
Low islands
a belt of volcanoes is called an island arc, they are formed from Hotspots/Mantle Plumes
Primary succession
A new small island is formed (also called Surtsey).
primary succession
A string of islands formed from a collision of two oceanic plates is called an island arc.
A circular coral island that encloses a lagoon is called an atoll. Atolls are typically formed from coral reefs that grow around the rim of a submerged volcanic island.
Continental volcanic arcs