01_Part_Opener.jpg Geology 107 - Physical Geology Fall 2006 Schedule: Lecture: MWF 11 AM, Room 112,...
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Transcript of 01_Part_Opener.jpg Geology 107 - Physical Geology Fall 2006 Schedule: Lecture: MWF 11 AM, Room 112,...
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Geology 107 - Physical Geology
Fall 2006 Schedule:Lecture: MWF 11 AM, Room 112, Chem AnnexLaboratory: Mon or Tues, Room 259 Natural History Bldg (Mon labs today!)
Text: Marshak, S. (2004) Earth: Portrait of a Planet 2nd Edition+ lab manual
Instructor Information:
Craig LundstromOffice: 255 Natural History Building Phone: 244-6293E-mail: [email protected] hours: M, W noon-1:30 pm, by appt.
Laboratory InstructorsEileen Herrstrom, 106 NHB, [email protected], 333-7732David Robison, 208 NHB, [email protected], 244-6048Melissa Farmer, 265 Morrill. [email protected], 244-9871
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field trip to Southeast Missouri on the weekend of October 13-15. This trip is required for geology majors and encouraged for others--
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Grading:Lecture Exams (54%) - There will be two one-hour lecture exams (13% each) given during regular class hours and one cumulative final exam (28%) during exam week.
EXAM I - Friday, Sept 29 --> Chapters 1-8
EXAM II - Friday, November 3--> Chapters 9-13
Final EXAM - Monday, December 11, 8-11 AM --> cumulative but will slightly emphasize the material covered after EXAM II
Laboratory exercises and exams (40%)
Field trip notes or web based assignment (4%)Take home problems (2%)
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ResourcesHazardsEnvironment/ClimateBasic knowledge about formation of the Earth, other planetsHow the Earth worksOrigin of life
Why study geology?
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Why am I interested?-
1. Issue of scale-both time and space
2. Still major questions to be answered-“Why does the Earth have continental crust?” (the reason for complex life!)
we are still experiencing the revolution of plate tectonics today
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General course content
I. Plate Tectonic context
II. Earth Materials/properties-formation
III. Interior processes/hazards/deep time
IV. Earths surface/hazards/human impact
V. Resources and Global Change
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A Brief Intro to Plate Tectonics…
Plate: a rigid, uppermost section of the solid Earth
~10 major plates moving slowly (~cm/yr rates)
-interaction along edges controls much of the tectonic/volcanic activity on Earth.
Exception is hot spot track like Hawaii
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1.Convergent margins- plates move toward each other:
subduction zones, continental collisions
2. Divergent margins- plates move away from each other:
mid-ocean ridges, rift zones
3. Transform boundaries- plates slide past each other:
strike slip fault, oceanic transforms
Types of Plate Boundaries:
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The Universe
Geocentric view did not disappear until late 1500s
Observe that spectra of distant galaxies/stars are all red shifted (doppler effect) means that everything is moving away from us--so entire universe is expanding.
Leads to the Big Bang hypothesis that expansion began at specific time from a giant explosion--13.6 Ga
Since then, things have been clumping together
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The Solar system
Formation from the solar nebula-rotating disk of gas and dust around proto-sun
Planetessimals form and these clumps combine to eventually form planets
4 inner planets -”terrestrial;” small and rocky 4 outer planets-” jovian;” gas and icePluto no longer a planet!!!
Our moon probably formed by collision with a mars-sized protoplanet (early-oldest moon rocks 4.44Ga while Earth/meteorite age is 4.56)
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This animation shows the collapse of a rotating dust cloud to form a solar system with a central star and orbiting planets. The angular velocity vector is yellow. Escape of light elements to the outer regions occurs immediately after the collapse phase.
PC version Mac version
Solar System Formation
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Comparison of the rocky planets
Similar bulk materials-but very different in process
Mercury-too hotVenus-also hot (green house)
Earth-PT, Cont CrustMars (cold-no greenhouse)
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Sun pumps out, atoms, radiation
(solar wind)
Earth has magnetic field that deflects much the solar wind
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Earth rotates on axis causing day and night
How do we know?
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Earth’s circumference calculated in 200 BC!
Within 2% of true value!!
24,865 miles40,008 km
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