GEOLOGY

Detailed explanation-1: -A batholith is a mass of rock that forms when a large body of magma cools inside the crust. Magma that hardens vertically underneath the surface will form a sill.

Detailed explanation-2: -A volcanic neck forms when magma hardens in a volcano’s pipe. Softer rock around the pipe wears away, which exposes hard rock. Dikes form when magma forces itself across rock layers and hardens.

Detailed explanation-3: -Introduction. Volcanic necks and plugs are the solidified remains of volcanoes’ conduit and plumbing systems that remain after the rest of a volcano has been eroded away.

Detailed explanation-4: -In reality, a volcanic neck is the solidified magma trapped inside a volcano. After millions of years, the softer outer layer of the volcano erodes, and all that remains is the volcanic neck.