Flexi Says: A volcano is a vent from which the material from a magma chamber escapes. Volcanic eruptions can come from peaky volcanic cones, fractured domes, a vent in the ground, or many other types of structures. The rock in the magma chamber melts and is under high pressure. As time passes, the rock in the magma chamber fractures the Earth's crust, leading to formation of a volcanic vent.
