Aleutians of Alaska mountain range has a volcano on it. When a volcano is formed or erupts, it can create a mountain on the ocean floor which is known as an island
Volcanoes are found on both land and the ocean floor. When volcanoes erupt on the ocean floor, they often create underwater mountains and mountain ranges as the released lava cools and hardens. Volcanoes on the ocean floor become islands when the mountains become so large they rise above the surface of the ocean.
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