112-pp15 - UNIVERSITY OF SOUTH ALABAMA Last time we...

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1 GY 112: Earth History Evolution Part 2 UNIVERSITY OF SOUTH ALABAMA Last time we covered… 1) The Earth 3.8 billion years ago 2) The first Organic Reactions? 3) The First Life Forms Earth’s Early Atmosphere Today: N 2 = 78%; O 2 =21%; Ar=1%; H2O=variable; CO 2 =0.03% 4.0 GA: N 2 ; HCl; SO 4 ; CO 2 ; CH 4 ; NH 3 ; NO 2 ; H 2 O NO…. O 2 How do we know? •Venus •Volcanic eruptions Earth’s Early Atmosphere 4.0 GA: N 2 ; HCl; SO 4 ; CO 2 ; CH 4 ; NH 3 ; NO 2 ; H 2 O Green house gases likely kept the Earth warm for the first 1-2 GA Earth’s First Life Forms This is good…. … otherwise we’d be like Venus and life as w know it would not exist on the Earth The Western Australia beasties were very “simple” single celled organisms like today’s bacteria = prokaryotes Earth’s First Life Forms
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2 The products were amino acids , organic compounds containing – NH 2 and –COOH radicals. Amino acids are the building blocks of proteins and proteins components of living cells. But Urey and Miller did NOT make life. The Earliest “Visible” Fossils But the Aussies have found some 3.865 GA old in Western Australia. Up until the early 1900’s,
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This note was uploaded on 02/04/2012 for the course GLY 112 taught by Professor Haywick during the Spring '12 term at S. Alabama.

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112-pp15 - UNIVERSITY OF SOUTH ALABAMA Last time we...

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