Since 1944, Vesuvius has given the impression of a rapidly cooled, quickly compacted pile of rock that has reached equilibrium except for the odd fumerole.    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference

In a January 27, 2009 file photo provided by the Alaska Volcano Observatory / U.S.G.S. steam and gas rise from a large fumerole on the north flank of Mount Redoubt, a 10,197-foot volcano in the Chigmit Mountains, in Alaska.    From Wordnik.com.  [Ottaway Online Editors] Reference