outline14 - HCN,. ..) Important factors for the Earth's...

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  Outline 14 3/7/03   Origin of the Solar System, Earth      Probable age  of the Earth - 4.5 - 4.6 bill. yrs.  based on Lead           isotopes, meteorites, moon rocks      Oldest crustal rocks on Earth - 4.0+ bill yrs. Origin of the Moon  + heavy meteorite bombardment in 1st 600 mill.      yrs.  of Earth history Density stratification to form core, mantle, + crust  early? Growth of the crust  and growth of the oceans  occurred together?      Most growth 4.0 - 3.0 bill. yrs. ago , slow increase since then? Outgassing  (volcanic eruptions) produced H2O  for oceans and       primitive reducing atmosphere  (H2, He, CH4, CO, NO, NH3, 
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Unformatted text preview: HCN,. ..) Important factors for the Earth's favorable climate (vs. Venus & Mars) 1. Distance from the Sun 2. Liquid H2O on Earth (Temp. n. const., CO2 , H2O to oceans) 3. Large Moon (vs. Earth size) - stabilize orbit, med. tilt of axis 4. Life on Earth (produce O2 ) 5. Large outer planets (intercept comets, stabilize orbits) 6. Plate tectonics (still active surface, cont. growth of oceans) Later change from reducing oxidizing atmosphere ~2.5 - 2.0 bill. yrs. ago Back to Outline Main page...
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This note was uploaded on 05/05/2011 for the course GEO 404c taught by Professor Staff during the Spring '08 term at University of Texas at Austin.

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outline14 - HCN,. ..) Important factors for the Earth's...

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