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Author Question: The oldest rocks found on Earth are about ____ years old. a. 14 billion b. 10.5 billion c. 7.0 ... (Read 173 times)

craiczarry

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on: Jul 27, 2018
The oldest rocks found on Earth are about ____ years old.
 
  a. 14 billion
  b. 10.5 billion
  c. 7.0 billion
  d. 3.9 billion

Question 2

Where did the cosmic microwave background (CMB) come from?
 
  a. Photons emitted from the first stars
  b. Photons released from hydrogen in our galaxy
  c. Light scattered by dust in our Solar System
  d. Photons released when electrons and nuclei combined for the first time.


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orangecrush

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

D

Answer to Question 2

D


craiczarry

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Reply 2 on: Jul 27, 2018
Great answer, keep it coming :)

adf223

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Reply 3 on: Yesterday
Excellent

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