Exam 2 review - Exam 2 review Lecture 8 The composition of...

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Exam 2 review Lecture 8 The composition of the Earth’s Atmosphere is nitrogen, oxygen and inert gases. Terrestrial Planets: Venus almost entirely CO2, atmospheric pressure 90x that of earth’s Mars almost entirely CO2, atmospheric pressure is 1% that of earth’s Jovian Planets: Jupiter, Saturn mostly H, He, and lesser amounts of CH4 and NH3 Pressure decreases exponentially with elevation Density decreases with elevation 4 layers of atmosphere ( thermosphere, mesosphere, stratosphere, troposphere) Thermosphere – very thin atmosphere - Mesopause Mesophere – coldest part of atmosphere - Stratosphere Stratosphere – thermally stable, ozone layer - Tropopause Troposphere – heated by sun’s energy at base, weather system, tropo means to change. We live here. First (primitive) atmosphere Composition – H2, He, NH3, and CH4 (the exact make up of the Jovian planets) No ozone layer at the time. Atmosphere completely anoxic (lack in oxygen) Second (chemical/premicrobial) atmosphere Composition – mainly water vapor, carbon dioxide and nitrogen(Venus is a good model)
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Exam 2 review - Exam 2 review Lecture 8 The composition of...

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