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mikael mikael
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Posts: 12017
9 years ago
Uranium-235, with a half-life of 713,000,000 years, decays to lead-207. If a rock sample is determined to have one-quarter of the uranium-235 content it had when it formed, the age of the rock sample can be estimated to be approximately ______ years old.
A) 178 million
B) 713 million
C) 28.5 billion
D) 1.4 billion
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wrote...
9 years ago
This is for essentials biology, right? the answer is D. Bye for now.
Would you know my name, if I saw you in heaven?

Eric Clapton
mikael Author
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Donated
9 years ago
Perfect, ty.
wrote...
9 years ago
Slight Smile Anytime
Would you know my name, if I saw you in heaven?

Eric Clapton
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