What is the term for an igneous intrusion that is forced between two layered rock units, typically creating a dome on the surface?

The term for an igneous intrusion that is forced between two layered rock units and typically creates a dome on the surface is a laccolith. A laccolith forms when magma intrudes into sedimentary rock layers, pushing them upwards, which creates a dome-shaped structure. This characteristic shape results from the pressure of the molten rock filling the space while solidifying, causing the overlying strata to deform.

In contrast, a caldera is a large depression formed after a volcanic eruption when the magma chamber below the volcano empties and causes the ground to collapse. A glacier refers to a large, slow-moving mass of ice formed by compacted snow. An inactive volcano is one that has not erupted in a considerable period but does not refer to the specific geological formation seen with laccoliths.