a volcanic island are formed by volcanic activity on the seabed,often near boundaries of the tectonic plates that form earth's crust. Lava erupts to form an undersea ridge.Layers of lava build up until a ridge breaks the sea's surface to form an island.
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Answer:
a volcanic island are formed by volcanic activity on the seabed,often near boundaries of the tectonic plates that form earth's crust. Lava erupts to form an undersea ridge.Layers of lava build up until a ridge breaks the sea's surface to form an island.