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The crevice through which magma bursts out of is called a volcanic vent. It is a fissure or opening in the Earth's crust through which molten rock, ash, and gases are expelled during a volcanic eruption. Volcanic vents can vary in size and shape.
Magma becomes lava after reaching a volcano's vent.Volcanoes have a pocket beneath the surface called a magma chamber. The magma moves upward through a pipe, witch is a long tube that connects the magma chamber to the surface.Molten rocks and gas through it's opening called a vent.It's all written here in a text book called Prentice Hall Earth Science. This information is at page 210.
Magma reaches the Earth's surface through a process called volcanic eruption. This occurs when pressure builds up underground and forces the magma to flow and eventually break through the Earth's surface. Once the magma reaches the surface, it is then called lava.
A vent through which gas, ash, and magma erupt onto Earth's surface is called a volcano.
The tunnel that magma goes through to reach the top of a volcano is called a conduit. This conduit is often a vertical pipe-like structure that connects the magma chamber beneath the volcano to the surface.