Author Question: By radiometric dating, the oldest mineral in a sedimentary rock was found to be 1.4 million years ... (Read 91 times)

B

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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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Answer to Question 1

Answer: B

Answer to Question 2

Answer: B



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