Seamount - Wikipedia
An intersting article about mountains that are completely submerged in water, many from volcanic origin.
https://en.wikipedia.org/wiki/SeamountOpen linkView original on feddit.orghttps://en.wikipedia.org/wiki/SeamountOpen linkView original on feddit.org
When lava pours out near the sea surface, tremendous volcanic explosions sometimes occur
In time, submarine seamounts, or islands, are formed