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Volcanic PlugA volcanic plug is a volcanic landform created when lava hardens within a vent on an active volcano. A plug can cause an extreme build-up of pressure if magma is trapped behind it, and this can sometimes lead to a devastating eruption. Often, erosion leads to the disappearance of the surrounding rock, while the erosion-resistant plug remains. An example of a landform created in this way is Chimney Rock, in Nebraska.
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