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===Dissection=== Through natural processes, mainly [[erosion]], so much of the solidified erupted material that makes up the mantle of a volcano may be stripped away that its inner anatomy becomes apparent. Using the metaphor of [[Anatomy|biological anatomy]], such a process is called "dissection".<ref>{{cite book|title=Volcanoes: What They Are and What They Teach|author=John W. Judd|author-link=John Wesley Judd|pages=114–115|publisher=Appleton|year=1881|url=https://archive.org/details/volcanoeswhatthe00juddrich/page/114/mode/2up}}</ref> When the volcano is extinct, a plug forms on its vent, over time due to erosion, the volcanic cone slowly erodes away leaving the resistant lava plug intact.<ref name=dkp/> [[Cinder Hill]], a feature of [[Mount Bird]] on [[Ross Island]], [[Antarctica]], is a prominent example of a dissected volcano. Volcanoes that were, on a geological timescale, recently active, such as for example [[Mount Kaimon]] in southern [[Kyūshū]], [[Japan]], tend to be undissected. [[Devils Tower]] in Wyoming is a famous example of exposed volcanic plug.
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