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drelog drelog
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8 years ago
The decay of 40K has a half of 1.3 × 109 years.  The age of the earth is estimated at 4.6 × 109 years.  The decay of 40K is a major heat source for the earth's interior.  Relative to today, how much more heat was produced by 40K in the early Archaeon era or 3.9 × 109 years ago?
A) 6x
B) 2x
C) 8x
D) 4x
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Earth Science

Earth Science


Edition: 14th
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PulsaPulsa
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8 years ago
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drelog Author
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#2
8 years ago
Exactly what I needed, exam is tomorrow!
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