A volcanic vent.
A bowl-shaped area that forms around a volcano's central vent is called a crater.
volcano
The opening in the center of a volcano is a crater.
The opening of a volcano is called the caldera.
the magma cools and hardens and then it becomes the surface of around the volcano like a rock land
A crater
Volcano!
Volcano.
Vent .
A caldera is a large opening caused by the collapse of the top of a volcano following a massive eruption. It can be several kilometers wide and typically forms when the magma chamber underneath the volcano is emptied during an eruption, leading to the collapse of the overlying land.
Vent
The width of a volcano opening can vary greatly, ranging from a few meters to several kilometers wide. It depends on factors such as the type of volcano and its activity level.