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Author Question: The present atmospheric concentration of carbon dioxide is approximately 400 ________. A) parts ... (Read 106 times)

bobbysung

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on: Jul 13, 2018
The present atmospheric concentration of carbon dioxide is approximately 400 ________.
 
  A) parts per hundred
  B) parts per thousand
  C) parts per million
  D) parts per billion
  E) parts per trillion

Question 2

Which of the following makes up more than 10 of the mass of the atmosphere?
 
  A) Water vapor
  B) Hydrogen
  C) Argon
  D) Helium
  E) Nitrogen


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wshriver

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Reply #1 on: Jul 13, 2018
Answer to Question 1

Answer: C

Answer to Question 2

Answer: E


bobbysung

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Reply 2 on: Jul 13, 2018
Wow, this really help

EAN94

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Reply 3 on: Yesterday
Excellent

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