When did Horizon Season 9 Episode 14 air?
Horizon Season 9 Episode 14 aired on April 17, 1972.


Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
In this report, Horizon looks at the various aspects of volcanoes and explaining the views of some vulcanologists.
Direct answers for episode-level questions and details.
Horizon Season 9 Episode 14 aired on April 17, 1972.
This episode runs for approximately 60 minutes.
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