Chapter01b - The Ear th and I ts Atmospher e: Chemical...

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Unformatted text preview: The Ear th and I ts Atmospher e: Chemical composition and ver tical str uctur e RECAP • Definition of an atmosphere: the gas surrounding a planet/ satellite/ comet/ … • Origin of the atmosphere. Three stages: ♦ I- gravitational capture of the gasses in the proto planetary nebula of the Sun (mainly H 2 , He); ♦ I I- outgassing of the planet (volcanoes, geysers,…); formation of an ocean (perhaps?); material from meteorites and comets; ♦ I I I – evolution of the atmosphere due to the presence of life and human activity. • The early atmosphere of the Earth is very different from the atmosphere today! • We learn about the formation and the evolution of the Earth’s atmosphere from the Earth’s geological records and by studying other planets. • The role of the atmosphere: protection from UV and cosmic rays, shields us from meteorites, decreases the day/ night temperature variations… Planets in the Solar System • Definition of a planet: a celestial body which ♦ is in orbit around the sun ♦ has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a ... nearly round shape ♦ has cleared the neighborhood around its orbit • Pluto disqualified since orbit overlaps with Neptune's. The Gainesville Solar Walk • Along NW 8 th Ave from 34 th St. to 22 nd St....
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This note was uploaded on 04/08/2008 for the course MET 1010 taught by Professor Matchev during the Spring '08 term at University of Florida.

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Chapter01b - The Ear th and I ts Atmospher e: Chemical...

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