in biology we are studying evolution and Darwin's theory. We have to do a research paper. One of the questions is "Why do Scientists believe that there was no Oxygen gas in Earth's Early atmospher." I know how we oxygen was created, but I can't find why scientists think it didn't exist. Does anyone know this answer?
If you do, please try and include your scource (my bibliography)
thanks!
2007-02-01 12:59:36 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Here's a NASA paper (with a website to perhaps find bibliographies to pursue) by Hannes Alfrien and Gustaf Arrenius:
http://history.nasa.gov/SP-345/ch26.htm
And, here's Lutgens and Tarbuck's text:
http://cwx.prenhall.com/bookbind/pubbooks/lutgens3/
2007-02-01 13:15:02 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Generally, we looked at the atmospheres of the other planets, such as Venus and Jupiter and Saturn, and assumed that the atmosphere of Earth was similar.
Oxygen is very reactive. I can imagine that without constant replenishing from plants, it'd probably be gone after a few million years.
2007-02-01 13:15:29 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Try this site. It's the first one that came up in a simple search. There must be many more. I searched "evidence before oxygen".
http://www.teachersdomain.org/resources/tdc02/sci/ess/earthsys/stetteroxy/
2007-02-01 13:16:06 · answer #3 · answered by ecolink 7 · 1⤊ 0⤋