GEOL 107 Lecture Notes - Lecture 7: Pyrite, Organic Compound, Archean
30 Sep 2017
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Geol 107 / geoe 207 -- history of life. Lecture 7 - in the beginning : origins of the earth and life (cowen, 2013, chapter 1) The origins of the earth and of life have been two of the earth"s great riddles since the dawn of human civilization, and has been a part of most of the world"s religions. Scientific explanations have been developing over the past few decades. Earth formed along with the rest of the solar system due to the condensation of remnants of a supernova 4. 567 billion years ago. Solidification of the earth"s crust and formation of a primitive atmosphere shortly after formation of the moon by 4. 5 ga, probably due to a massive impact on earth. Oceans had formed by 4. 2 ga at the latest. It seems unlikely that there was life on the surface of the earth prior to 3. 8 ga since the great.
