NATS 1750 Study Guide - Winter 2018, Comprehensive Midterm Notes - Earth, Weimar Republic, Adolf Hitler
12 Oct 2018
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Document Summary
1 second after the big bang the universe cooled to 10 9 k or c - protons/electrons/neutrons created. About 1 billion years later - quasars and active galaxies formed. 10 billion years ago: galaxies moved apart and our galaxy (the milky way) formed. 5 billion years ago: our solar system formed. Our star, the sun, is a 2nd generation star. Primary atmosphere of h, he and h 2 o blown off by solar wind from the sun. Volcanic emissions: h 2 o 85%, co 2 10% , n 2 2% + so 2 . Atmosphere today: n 2 78%, o 2 10%, ar 0. 9%, co 2 350 ppm. (ppm = parts per million) Photochemical: water + light o 2 + h (the h escaped to space) More important - photosynthesis: h 2 o + co 2 + light ch 2 o (in organism) + o 2 (in air)
