What is a volcanic eruption? (URGENT)?

Question

What is a volcanic eruption, how does it happen?

Answer 1

Deep inside Earth, between the molten iron core and the thin crust at the surface, there is the mantle, a large layer of rock that is largely solid, but flows like plastic. When, for various reasons, rock from the mantle melts, it sometimes moves to the Earth’s surface through weak spots in the crust, releasing heat, gasses, and rock--a volcanic eruption.

Answer 2

It's when a volcano blows up! It happens when hot magma (lava) forces it's way to the surface of the earth through cracks and fissures underground into a dome inside a volcanic mountain and when the pressure is too great the dome bursts open throwing the lava and earth and mountain into the atmosphere!