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Author Question: _____ are massive objects destined to become planets. A) Planetesimals B) Protoplanets C) ... (Read 81 times)

tiffannnnyyyyyy

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on: Jul 27, 2018
_____ are massive objects destined to become planets.
 
  A) Planetesimals
  B) Protoplanets
  C) Preplanets
  D) Pseudoplanets

Question 2

Which of the following statements is true in the context of radioactive elements?
 
  A) The abundances of the daughter isotopes of radioactive elements in a rock gradually decrease.
  B) The abundance of a radioactive element in a rock gradually decreases.
  C) Uranium-238 has the longest half-life among all the other radioactive substances.
  D) Potassium-40 has the longest half-life among all the other radioactive substances.


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bdobbins

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Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

B


tiffannnnyyyyyy

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Reply #2 on: Jul 27, 2018
Thank you!


bdobbins

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Reply #3 on: Jul 27, 2018
Always glad to help...


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