A paleontologist estimates that when a particular rock formed, it contained 12 mg of the radioactive isotope potassium-40. The rock now contains 3 mg of potassium-40. The half-life of potassium-40 is 1.3 billion years. From this information, you can conclude that the rock is approximately ______________ billion years old.

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
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ISBN:9781305967359
Author:STARR
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Chapter16: Evidence Of Evolution
Section: Chapter Questions
Problem 6SA: True or false? Wrinkly textures in rock that formed from ancient biofilms living in marine sediments...
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A paleontologist estimates that when a particular rock formed, it contained 12 mg of the radioactive isotope potassium-40. The rock now contains 3 mg of potassium-40. The half-life of potassium-40 is 1.3 billion years. From this information, you can conclude that the rock is approximately ______________ billion years old.

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