GLY-1102 Lecture Notes - Lecture 6: Plate Tectonics, Geomagnetic Reversal, Longwave
17 Sep 2018
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Volcanoes spew gasses, hydro and nitro and co2 into atmos, water spews out into oceans, water vapor into atmos until condensation. Great rain out, when water vapors cooled to rain, rains down and forms ocean. Evidence of oceans as early as 3. 8 bill. Evolution of sun like stars suggests that early sun eas much less than radiation today. However, temps were high enough to sustain liquid water. If the earth absorbed and radiated heat in an ideal manner, thesurface temp woulf be -20c. Instead, greenhouse gasses esp h2o and co2, intercept and absorb earthsoutgoing long wave radiation, thereby warming surface. Co2 is water soluble, react to for bicarbonate hco3- Problem- if all co2 made into limestone, earth gets very cold. Broken into 7-8 major plates, several minor plates. Float on top of asthenosphere (partially molten mantle material) Theory is mainly about the interactions at plate boundaries. Most are located along crests of oceanic ridges, ex: mid atlantic ridge.
