Science Fair Project Encyclopedia
Volcanic plug
A 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.
10-26-2009 08:16:03
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details