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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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- Spring '08
- Solar System, bill. yrs., Oldest crustal rocks, Earth Probable age