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Author Question: By radiometric dating, the oldest mineral in a sedimentary rock was found to be 1.4 million years ... (Read 66 times)

B

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on: Jul 29, 2018
By radiometric dating, the oldest mineral in a sedimentary rock was found to be 1.4 million years old. What is the age of the sedimentary rock?
 
  A) 1.4 million years
  B) no older than 1.4 million years
  C) no younger than 1.4 million years
  D) Radiometric dating does not work for sedimentary rocks.

Question 2

In radioactive decay, when the parent material decays to one-quarter of its original amount, the time is
 
  A) one half-life.
  B) two half-lives.
  C) three half-lives.
  D) four half-lives.


matt

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Reply #1 on: Jul 29, 2018
Answer to Question 1

Answer: B

Answer to Question 2

Answer: B


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