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"However, ancient fossil soils – the best indicators of ancient carbon dioxide levels in the atmosphere – suggest only modest levels during the Archean.

Other atmospheric greenhouse gases were also present, in particular ammonia and methane, but these gases are fragile and easily destroyed by ultraviolet solar radiation, so are unlikely to have had any effect." But another climate-warming theory – one the team wanted to test – is that the amount of nitrogen could have been higher in the ancient atmosphere, which would amplify the greenhouse effect of carbon dioxide and allow the Earth to remain ice-free.

I don't recall him ever hunting with it and it looks very good with some small dings and minor scratches from handling...

I had shot it maybe 10 years ago when I went hunting phesant for the 1st time...first time I shot it it slapped me hard (but taught me a lesson) Anyway...

Life evolved on Earth during the Archean, between 3.8 and 2.4 billion years ago, but the weak Sun should have meant the planet was too cold for life to take hold at this time; scientists have therefore been trying to find an explanation for this conundrum, what is dubbed the 'faint, young Sun paradox'.

"During the Archean the solar energy received at the surface of the Earth was about 20 to 25 % lower than present," said study author, Dr Ray Burgess, from Manchester's School of Earth, Atmospheric and Environmental Sciences.Today, our writers, editors, podcasters and video hosts share all the things we're most excited to learn about with nearly 30 million visitors to the site each month.Learn more about our authors, and maybe even become one yourself. How Stuff Works creates great content that can live on just about any platform! Audio podcasts on i Tunes total more than 35 million downloads a month, including some of the most popular titles, such as Stuff You Should Know and Stuff You Missed in History Class.How Stuff Works got its start in 1998 at a college professor's kitchen table.From there, we quickly grew into an award-winning source of unbiased, reliable, easy-to-understand answers and explanations of how the world actually works.I don't know anything about it other than it has been in the family as long as I can remember..help would be appreciated... Thanks, Bill Left side of barrel: Selected Forged Steel Proof Tested 12 Gauge ---2 3/4 inch Chamber-- Side Plate Left Side: Stevens Savage Arms Corporation Chicopee Falls, Mass. I just would like to know more about dad's gun (I can't beleive my older brother gave it to me after hearing of me renewed interest in shotguns) Thanks, Again!

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