Underwater Volcanos

Underwater volcanos don't spew normal lava. The lava changes into 'Pillow vessels' there will be rocks that will pour lava out that will turn into balls of lava that look like pillows.
That is why they are called pillow vessels. The water cools the lava much faster than air can, the lava is more thinner and soupier than what it is on land. There are also these gas eruptions exploding underwater, on the surface of the water it should be hot sometimes but not always. It is exactly the same thing that happens on land, but on land it just dissolves in air at some stage instead of just being gloopy underwater.