S1·E21 The Mohole: Earth's Crust
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Aired April 2, 1961
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Frequently Asked Questions
When did Season 1 Episode 21 of The Nature of Things air?
Season 1, Episode 21 ('The Mohole: Earth's Crust') originally aired on April 2, 1961.
How long is Season 1 Episode 21 ('The Mohole: Earth's Crust')?
The episode follows the standard broadcast runtime for The Nature of Things.
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