Overview:This episode of Horizon examines 20 years of research which has led to a new theory on how the earth's crust was made.
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First Air Date: Feb 04, 1964Last Air date: Jul 14, 2022Season: 59 SeasonEpisode: 1161 EpisodeRuntime: 60:14 minutesQuality: HDIMDb: 3.596 / 10 by 26 usersPopularity: 105.929Language: en
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