Ans. A volcanic vent is described as an opening that is exposed on the earth's surface, from where the volcanic material is emitted or comes out. The volcano with its cone-shaped structure, or the edifice, is built with the more-or-less symmetrical accumulation of the lava also known as the pyroclastic material on this central vent.Volcanic vents are the openings in the Earth's crust from where the lava and the pyroclastic flows are ejected out. After the volcanic eruptions, these volcanic vents continue to release steam and gas fumes through the small openings that are the surrounding of a volcano which are known as the fumaroles.