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Lec2 - University of California Berkeley Civil Engineering...

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University of California, Berkeley Professor Ken Johnson Civil Engineering 70 Engineering Geology Civil Engineering 70 Lecture 2 8/30/07 Chi Epsilon Tutoring – TuTh 2-5PM in 544 Davis Structure of the Earth Earth Composition and Plate Tectonics Uniformitarianism o “The geologic processes we see in action today have worked in much the same way throughout geologic time” Inner Planets o Aggregations of stony meteorites o More dense than the Outer Planets which are gaseous Earth Composition o Earth Layers Crust 0-40km Mantle 40-2891km Liquid iron outer core 2891-5150km Solid iron inner core 5150-6370km o Whole Earth 35% Iron, 30% Oxygen, 15% Silicon, 13% Magnesium o Earth’s Crust 46% Oxygen, 28% Silicon, 8% Aluminum Earth is an open system o Sun drives external engine Heat radiating from Earth balances solar input and heat from interior Drives our climate Earth Systems o Climate System All four subsystems interact together and that’s where the issue of sustainability comes to play Cryosphere Ice Hydrosphere Water Biosphere All Living Matter Atmosphere Air Buffer between space and sun o Plate Tectonic System o Geodynamo System Inner/Outer Core Drives our magnetic poles Timeline Lecture 2 1 of 4 8/30/07 Written By Raymond Leung
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University of California, Berkeley Professor Ken Johnson Civil Engineering 70 Engineering Geology o
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