What process, absent on the Moon, is responsible for Earth's persistent internal heat?
Answer
Plate tectonics
Earth maintains a hot interior and active volcanism largely due to plate tectonics, a process that constantly recycles the planet's crust and facilitates heat exchange. The Moon does not possess a mechanism for tectonic recycling, which makes the evidence of volcanic activity as recent as 120 million years ago particularly puzzling. This discrepancy highlights that the Moon may have unique, internal ways of generating or retaining heat that science has yet to fully understand.
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