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Lecture0710fa - Chemistry 83 Formation of the solar system...

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Chemistry 83 09/21/10 1 Formation of the solar system and description of planet earth Cloud of dust and gas Gravitational Contraction Rotation and disk formation Break up into protosun orbited by protoplanets Solar fusion begins and drives H and He outward Thompson, Turk,”Earth Science and Environment”,Saunders,New York, 1995, 14
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Chemistry 83 09/21/10 2 Buell/Girard, “Chemistry”, Prentice Hall, New Jersey, 1994, p. 28 Terrestrial Planets (rocky) Giant Planets (gaseous) * *Except for Pluto, the terrestrial planets are all located nearest the sun http://www.meta-synthesis.com/webbook/32_n-synth/nucleosynthesis.html The sun is very large compared to all the planets around it The gaseous planets are large compared to the rocky planets Pluto is the smallest of the rocky planets
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Chemistry 83 09/21/10 3 Buell/Girard, “Chemistry”, Prentice Hall, New Jersey, 1994, p. 28 Pluto orbits in a different plane from the rest of the planets *Pluto (rocky) was demoted to status of dwarf planet on 8/24/06 by International Astronomical Union. Buell/Girard, “Chemistry”, Prentice Hall, New Jersey, 1994, p. 31 Earth consists of layers Lower boundaries: Crust ~25 miles Mantle ~1800 miles Outer core ~3200 miles Inner core ~4000 miles
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Chemistry 83 09/21/10 4 Moeller, “Chemistry”,Academic Press, New York, 1984, 929 Layers suggest that earth melted after it is was formed and its molten components differentiated, i.e., gravity formed layers based on density Core of earth contains the heavy metals: Fe and Ni Metals in the core produce a giant magnet that redirects incoming radiation from outer space to the poles. Later we will
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