A Volcanic vent is a fissure or a crack in a volcano through which lava, ash, steam, and gases are emitted. It is a tube-like structure with small cracks that penetrate deep into the earth's crust, where temperatures can reach anywhere from 1300 to 2200 degrees Fahrenheit.
The depth of the vent varies based upon eruptions and the buildup of cooled magma that has formed the volcano at the top and the hot magma below. There is no standard depth for the vent because the magma depth is anywhere from about 3,300 feet to 33,000 feet. Scientists study vents to learn more about specific volcanoes.