What is the term for a large hole at the top of a volcano?

The term for a large hole at the top of a volcano is referred to as a crater. A crater forms when material is ejected from the volcano during an eruption, which can lead to a depression at the summit. This depression is often circular and can vary in size, depending on the scale of the eruption.

In contrast, a caldera is a larger depression that forms when a volcano erupts and the magma chamber empties, causing the ground above it to collapse. The summit refers to the highest point of the volcano, and a vent is the opening through which volcanic materials are expelled during an eruption. Understanding these terms helps clarify the different features associated with volcanic activity.