lava
a valcano
Vent
lava
Volcanoes
An opening in Earth's crust through which lava flows is called a volcano. When pressure from molten rock beneath the surface builds up, it can erupt through the volcano, releasing lava, ash, and gases into the surrounding area.
a valcano
Valcano
A volcano erupts when molten rock, known as magma, flows through a central opening in the Earth's crust called a vent. This release of magma, gases, and ash can result in a volcanic eruption.
Crater or vent. Sometimes lava also comes from fissures as well. However crater is the most commonly used term.
Lumen
it is just called molten rock, and it comes out of the Earths crust via volcanoes. you can also say that its melted lava
the opening where the lava flows is call a vent