a volcanic neck
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When magma hardens in a volcano's pipe, the result will eventually be a volcanic neck or volcanic plug. This landform is a solidified remnant of magma that once filled the volcano's vent.
Igneous rock.
The rock that forms when magma hardens beneath the Earth's surface is called an intrusive igneous rock. Examples include granite and diorite.
Yes, that's correct. Sills are igneous rock formations that form when magma is intruded horizontally between rock layers and then solidifies underground. If the magma solidifies vertically underneath the surface, it will create a sill structure.
Magma forms igneous rock when it cools and hardens. Igneous rocks can be further classified as intrusive (formed below the surface) or extrusive (formed on the surface).