Yes.
their is volcanoes and underwater islands
under water
There are more under water than on land.
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yes. some types of basalt is found of volcanoes.
Hawaii has 3562 volcanoes, but only 387 of them are under water.
under water mostly but you can find them on the crust!
yes
Volcanoes are not alive, but yes. It is estimated that about 3/4 of the world's volcanic activity occurs underwater.
Yes. If this did not happen we would not have volcanic islands.
because they were formed under the sea so when they erupt the can form tsunamis
Yes they do occur under volcanoes