Volcanic eruptions that take place underwater, like those above water, spew lava and various gases that have risen through the Earth’s crust to the surface. Underwater volcanoes create hills or mountains formed by lava hardening into rock after enough contact with the cold ocean water. If the volcano is big enough, the resulting mountain may even become and island. Many oceanic island chains were actually formed by volcanoes during a process of thousands of years. However, it doesn’t have to take that long to create a small new island; very small islands have been known to form in a matter of days thanks to underwater volcanic activity.
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