A volcano " vents " gas when pressure builds up
It is called Eruption.
E r u p t i o n or maybe phreatic
bubbles
A vent through which gas, ash, and magma erupt onto Earth's surface is called a volcano.
Such a hole is called a fumarole.
A mountain with a crater is called a volcanic mountain or a volcano. It is created when molten rock, ash, and gas are expelled from the Earth's mantle through a vent or opening in the Earth's surface.
The top pit of a volcano is called the crater. It is the opening at the summit of the volcano where volcanic activity such as eruptions and gas emissions occur.
When a volcano throws lava into the air, it is called a lava fountain or a lava fountain eruption. This happens when gas bubbles within the lava force it out of the volcano's vent, causing it to shoot upward in a fiery display.
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.
A stratovolcano, also known as a composite volcano, is formed from violent eruptions characterized by explosive activity that ejects a mixture of lava, ash, and volcanic rocks. These eruptions are typically associated with high levels of gas pressure within the magma chamber, leading to explosive events.
This is the description of a volcanic eruption.A eruption.