What is the long-term heat balance of Earth? How did its internal temperature decay since it formed by accretion of chondrites? How…

What is the long-term heat balance of Earth? How did its internal temperature decay since it formed by accretion of chondrites? How abundant are radiogenic elements in the interior? Did a "faint young Sun" ever warm a "snowball Earth"?

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Source: List of unsolved problems in geoscience (CC BY-SA 4.0)