The young Earth had a much larger number of radioactive isotopes but a much lower heat production from them than it does now.

Name: The young Earth had a much larger number of radioactive isotopes but a much lower heat production from them than it does now.
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The young Earth had a much larger number of radioactive isotopes and a much higher heat production from them than it does now, as many of these isotopes have decayed over billions of years, reducing their abundance and the heat they produce.

The Young Earth Had a Much Larger Number of Radioactive