When did Horizon Season 7 Episode 35 air?
Horizon Season 7 Episode 35 aired on December 14, 1970.


Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Horizon investigates the work of geologists and seismologists trying to predict the date of the next great earthquake in San Francisco, California.
Direct answers for episode-level questions and details.
Horizon Season 7 Episode 35 aired on December 14, 1970.
This episode runs for approximately 60 minutes.
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