Dynamic Earth Ch. 1 notes
Dynamic Earth Ch. 1 notes GEOL 1100 - 001
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This 2 page Class Notes was uploaded by Margaret Notetaker on Friday August 28, 2015. The Class Notes belongs to GEOL 1100 - 001 at Auburn University taught by John F Hawkins in Fall 2015. Since its upload, it has received 230 views. For similar materials see Dynamic Earth in Geology at Auburn University.
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Date Created: 08/28/15
CHAPTER 1 Planets Super Nova 0 Iron produced in mass amounts in the core 0 To fuse or break up Iron requires energy 0 Run out of energy producing Iron 0 Creates a planetary nebula o Protostar forms from debris Planetesimal 0 Baby planet made of rocks from supernova o All the ricks collide and melt together Terrestrial 0 Very rocky 0 Gas cloud is stripped away by strong solar winds Gaseous 0 Have a Terrestrial planet in the core 0 Retain a gas cloud because far away from solar winds Outside amp inside are different elements Heavier elements are pulled to the center by gravity Makes the Earth rotate slower than usual Controls the tides Formed from massive impact of a rock colliding with Earth Collision gave Earth the 234 tilt Precession Earth wobbling on its axis Has massive lava ows that cooled Rotates at the same speed that orbits the Earth Internal Heat Kinetic energy converting into thermal energy by collisions o Eventually wears off Radioactive decay of elements maintain Earth s heat 0 Potassium amp Uranium main elements that decay 0 Potassium is the most abundant Mars began plate tectonics that would differentiate the planet 0 Could not nish because ran out of energy Venus is too close to the sun to have differentiation Earth the only geologically active planet Earth Systems 4 Spheres Lithosphere rock 0 Layers of the Earth inner core outer core mantle crust 0 Inorganic thin solid brittle rigid cool 0 Continental CHAPTER 1 I Low density amp felsic SiOz rich I Generally lighter in color 0 Oceanic I High density amp ma c Fe MG Ca Ni etc I Generally darker in color Hydrosphere water 0 97 Earth s water found in Oceans o Oceans lakes rivers streams groundwater moisture from the atmosphere Atmosphere gas 0 Layer of gases protecting the Earth 0 1 atmosphere 147 lbin2 o 1 atmosphere sea level 0 99 of all gas is below 50km elevation Biosphere life 0 All life found 3m below ground amp 30m above ground Scienti c Method lgt Systematic logical approach to address a problem 1 De ne the problem 2 3 Hypothesize produce a scienti c explanation Collect and evaluate data a Must be reasonable and testable but not proven Test hypothesis over time Theory 0 Scienti c idea supported by abundance of evidence 0 Must pass every test cannot fail one Scienti c Law 0 Must be absolutely true 0 If it violates the physical world then the world cannot exist Law of Original Horizontality 0 Nicolas Steno 163 81686 0 Sediments that ow into a body of water must settle horizontally 0 Grand Canyon all horizontal rock formations o If not horizontal then something must have effected the rocks Law of Superposition 0 Nicolas Steno 163 81686 0 In an undisturbed sedimentary sequence the oldest rocks are at the bottom and the youngest are at the top
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