A volcano " vents " gas when pressure builds up
It is called Eruption.
E r u p t i o n or maybe phreatic
bubbles
Such a hole is called a fumarole.
A prominence is when a solar flare ejects matter from the suns surface as a stream of incandescent gas.
Gas is stored in the Magma chamber at the bottom of the volcano, along with the magma.
This is known as a volcano.
This is the description of a volcanic eruption.A eruption.
A Planetary Nebula
A live volcano is simply called an active volcano.
A lateral blast is an explosive volcanic eruption the ejects material horizontally to one side rather than vertically as most explosive eruptions do.
Molten rock and gas leave a volcano though a vent.