For anyone interested, I recommend a BBC Horizon documentary about the earth's core called "The Core". I found about it on HN and quite enjoyed it.
https://news.ycombinator.com/item?id=4035519 https://news.ycombinator.com/item?id=13486960
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Sounds interesting, but the video doesn't seem to be available anymore. I'd be interested if anyone has a working link!
You can download it from this archive.org collection (s2011e12): https://archive.org/download/BBCHorizonCollection512Episodes