<p>Schematic representation of the internal structure of a typical <a href="https://en.wikipedia.org/wiki/cinder_cone" class="extiw" title="en:cinder cone">en:cinder cone</a>
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From "Principal Types of Volcanoes", <a rel="nofollow" class="external free" href="https://pubs.usgs.gov/gip/volc/types.html">http://pubs.usgs.gov/gip/volc/types.html</a>