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Author Question: Near Earth's surface, ____ occupies about 78 and ____ about 21 of the total volume of dry air. A) ... (Read 57 times)

faduma

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on: Jul 13, 2018
Near Earth's surface, ____ occupies about 78 and ____ about 21 of the total volume of dry air.
 A) nitrogen; oxygen
  B) hydrogen; oxygen
  C) oxygen; hydrogen
  D) nitrogen; water vapor

Question 2

The most abundant gases in Earth's present day atmosphere (by volume) are ____.
 A) carbon dioxide and nitrogen
  B) oxygen and water vapor
  C) nitrogen and oxygen
  D) oxygen and helium


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xiazhe

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

A

Answer to Question 2

C


faduma

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

upturnedfurball

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Reply 3 on: Yesterday
Excellent

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