How are volcano's made underwater?

Answer 1

At convergent plate boundaries, the plates shift towards each other and collide. This high-degree collision forms underwater volcanoes. When two plates collide, one of the two plates subducts beneath the other, and oceanic trenches are formed.

Answer 2

Same way they're made on land. The hot magma under ground pushes up through the ground to the surface to become known as lava. But in the case of under water, like off the Hawaiian Islands, the "surface" is the ocean bottom. So the lava belches up through the ocean bottom, cools and hardens.

After repeating that for centuries, enough lava has hardened and piled up to broach the ocean's surface. And that's called an island. In fact the whole of the Hawaiian Islands was formed that way...by volcanoes popping up under the ocean and continuing to pile up until they reach the surface of the ocean and become islands. Some of those islands still have active volcanoes on them.

Answer 3

hot magna spillsinto water the watercools it and it hardebs toformaniothervalocaonoe