January 7, 2013

How the Early Earth Avoided a Deep Freeze

Scott Johnson, Ars Technica

AP Photo

Although life seems to have gotten a quick start on it, the early Earth was a nasty place. Very early on (and perhaps again later), meteors frequently peppered the surface. The atmosphere contained no oxygen, and consequently no ozone, to shield the surface from UV radiation.

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TAGGED: Nitrogen, Hydrogen, Greenhouse Effect, Ice Age