Volcanic Plug Formation Process

What is a Volcanic Plug?

A volcanic plug, also known as a volcanic neck or volcanic core, is a geological landform that forms when magma solidifies within the vent of an extinct volcano. It is essentially the solidified remnant or "plug" of volcanic material that once filled the conduit leading from the magma chamber to the Earth's surface.

Formation of a Volcanic Plug

- Volcanic eruption through a vent leads to the formation of a volcano
- Magma cools and solidifies in the vent forming a volcanic rock
- Over time, the soft upper part of the volcano is worn away by agents of erosion.
- The volcanic rock in the centre is left standing and is called volcanic plug

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