GEO 102 Lecture 22Outline of Last Lecture I. Study GuideOutline of Current Lecture II. Time Scale to MemorizeIII. Origin of the UniverseIV. Origin of the Sun and EarthV. The AtmosphereCurrent LectureTime Scale to Memorize- Eons: Hadean, Archaen, Proterozoic, Phanerozoic - Eras of the Phanerozoic: Paleozoic, Mesozoic, Cenozoic- Periods of the Paleozoic and Mesozoic: Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, and CretaceousOrigin of the Universe- 13.75 billion years (give or take 0.11)o Initially inferred from expansion- Doppler shifo Radiation remains-cosmic background radiationo First true atoms formed ~379,000 years afer Big BangOrigin of the Sun and Earth- Matter from prior stars condensed (gravity)- Planets accreted from rotating disk of matter- Less volatile matter near sun (stony planets), less dense accreted farther (gaseous planets)- Moon formed from early impactThe Atmosphere- Originated through outgassing- 1st one (mostly H) was lost to solar windThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Core differentiation/ magnetism protect
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