45: As Above, So Below
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45: As Above, So Below
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What was Earth's mantle like 3.8 billion years ago, and how do we know?
The mantle is a realm that humans have never visited, and examining it is only harder in the ancient past. Fortunately, the mantle sometimes gifts us with beautiful green rocks from the deep, souvenirs of an unknown underworld. Today, we learn how the mantle has changed over time, and its surprising connections to outer space. On the way, we'll meet the father of geochemistry, revisit old asteroid friends, and learn why you should always flour your berries before making a cake.
Extra Credit: Bake some blueberry muffins.
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