This episode gives a basic review of geochemistry, starting with pioneers such as Christian Friedrich Schönbein, Frank Wigglesworth Clarke, and thence into the 20th century, especially Victor Goldschmidt. We hear about the development of geochemical societies around the world, then we talk about various subfields of geochemistry. The question of "what's inside the Earth" is still a very active one, and we discuss ways to simulate the pressure inside the Earth, and likely constituents of the Earth's core.

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