Answer:

VOLCANO

AnswerCrossword Clue
VOLCANOIt's dangerous when active
VOLCANOMars's Olympus Mons, for one
VOLCANOMount St. Helens, for one
VOLCANOOccasional erupter
VOLCANOMauna Loa, e.g.
VOLCANOIt may be active
VOLCANOMount Rainier, e.g.
VOLCANOPeru's El Misti, e.g.
VOLCANOCone site
VOLCANOEl Misti, e.g.
VOLCANOWilshire, in a '97 film
VOLCANOGranite source
VOLCANOIsland group to which Iwo Jima belongs.
VOLCANOLassen or Stromboli.
VOLCANOLassen of Asosan.
VOLCANOWhat Popocatepetl is.
VOLCANOLassen, for example.
VOLCANOHekla, for example.
VOLCANOLassen or Hekla.
VOLCANOLassen, for one.
VOLCANOSpitfire, so to speak
VOLCANOStromboli, e.g.
VOLCANOSpot for a blowout
VOLCANOPyroclastic flow source
VOLCANOOne prone to blowing off steam