Was digging around and found some good info, looks like tomr already answered the Nitrogen part of the question, which is the same info I found. As far as meth

Was digging around and found some good info, looks like tomr already answered the Nitrogen part of the question, which is the same info I found. As far as methane, it seems to all mostly be biogenic[1]. [1] - http://www.astrobio.net/news-exclusive/methane-on-earth/ http://www.astrobio.net/news-exclusive/methane-on-earth/