When did Horizon Season 17 Episode 25 air?
Horizon Season 17 Episode 25 aired on December 15, 1980.


Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Chronicles the efforts of geologists throughout the summer of 1980 to study the recently erupted volcano Mt. Saint Helens in Washington State, USA.
Direct answers for episode-level questions and details.
Horizon Season 17 Episode 25 aired on December 15, 1980.
This episode runs for approximately 60 minutes.
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