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Geologic Time Scale
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Precambrian 4.6 bya 570 mya
90% of earth history
Erosion / metamorphism destroyed significant portions of rock record
most information is lost
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4.5 bya Moon was formed
How? 1. Moon is an asteroid captured by gravity of earth 2. accreted from many small objects impacting eachother
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during molten phase, gasses trapped in magma were released
volcanoes continue out gassing today
5. Carbon Dioxide 2. Hydrogen 6. Nitrogen 3. Hydrogen Chloride 7. Methane 4. Carbon Monoxide
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