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Author Question: The percentages of various gases in the atmosphere indicate that the composition of the atmosphere ... (Read 163 times)

erika

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on: Jul 14, 2018
The percentages of various gases in the atmosphere indicate that the composition of the atmosphere is controlled
 
  A) totally by the amount and type of gases given off during volcanic eruptions.
  B) totally by the composition of comets and meteors that strike Earth.
  C) to a significant extent by biological processes occurring on Earth.
  D) exclusively by chemical reactions between sunlight and the gases in the atmosphere.

Question 2

Oxygen ( ) is
 
  A) a gas which principally originates from volcanic sources.
  B) a by-product of photosynthesis.
  C) one of the gases from Earth's earliest atmospheres.
  D) now measured at 78.084 by volume in the homosphere.


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pikon

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Reply #1 on: Jul 14, 2018
Answer to Question 1

C

Answer to Question 2

B


erika

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Reply 2 on: Jul 14, 2018
:D TYSM

isabelt_18

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Reply 3 on: Yesterday
Wow, this really help

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