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!

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



    posted by PsyDAG

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