science

Which of the following gases was most likely present in Earth's earliest atmosphere?
a. nitrogen
b.hydrogen
c.argon
d.oxygen

Help me please!

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asked by Eric
  1. Since this is not my area of expertise, I searched Google under the key words "earth's early atmosphere gases percentages" to get these possible sources:

    https://www.google.com/search?client=safari&rls=en&ei=hreaW5DbN9mT0PEP2_CU-Aw&q=earth%27s+early+atmosphere+gases+percentages&oq=Earth%27s+earliest+atmosphere&gs_l=psy-ab.1.0.0i71l8.0.0..154980...0.0..0.0.0.......0......gws-wiz.mnPvqDY5A4M

    In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.

    http://www.hackcollege.com/blog/2011/11/23/infographic-get-more-out-of-google.html

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    posted by PsyDAG

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