North American Gold
Clip: Season 42 Episode 22 | 2m 28s
When the Earth formed, most of the gold sunk to its core—but some remained trapped inside Earth’s mantle.
Aired: 05/23/18 |
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Making North America: Human
S42 Ep22 | 53m 37s
Inside Einstein's Mind
S42 Ep23 | 53m 7s | WETA Passport
Making North America: Life
S42 Ep21 | 54m 6s
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