A volcanic plug, also called a volcanic neck or lava neck, is a
volcanic landform created when
lava hardens within a
vent on an active volcano. When forming, a plug can cause an extreme build-up of
pressure if
volatile-charged
magma is trapped beneath it, and this can sometimes lead to an explosive eruption. If a plug is preserved,
erosion may remove the surrounding rock while the erosion-resistant plug remains, producing a distinctive landform.
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