review_101 - Geology 101 Review Material(Midterm and Final...

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Geology 101 Review Material (Midterm and Final) 1. How does the earth become compositionally zone? You should have knowledge of the 6 evolutionary stages that show how the earth could evolve from a "homogeneous mixture of primordial dust (planetesimals) to the compositionally zoned planet containing an Fe-Ni core, Fe-Mg silicate mantle and Fe-Mg-Al Crust. Compositional zonation based on density. Think ice cubes (silicate minerals) vs wax (iron-nickel) melting in a beaker. The materials will not become compositonally zoned until the melting temperature of wax is exceeded. 2. Physical properties of asthnosphere and lithosphere. You should have knowledge of the composition and physical properties of the lithosphere and asthenosphere. Asthenosphere-lithosphere relationship is important to understanding plate tectionics. 3. Evidence of compositional characteristics of the internal structure of the earth. -overall densisty of earth is 5.5 gm/cm 3 density of crust 2.6-3.0 gm/cm 3 provides some information regarding the density of the interior zones. -meteorites are inferred to be composed of same material that earth was derived -earth has a magnetic field supports the argument for the core being metallic and the outer core being liquid (i.e., convecting electrons surrounding metallic solid inner core will generate magnetic field). -seismic properties (velocities, absorption of S-waves by outer core). -Why do P-wave and S-wave shadow zones form? Why is the S-wave shadow zone larger? 4. Gravitational Anomalies (from your text book reading) -result from density differences of underlying rocks. Higher density crust (i.e., ocean) will have a positive gravity anomaly compared to lower density crust (i.e., continental). Gravity anomalies do not result from altitude and latitude differences on the earth (we subtract these effects out of anomaly measurement). 5. What is isostasy? (from your text book rading)
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-think about the lighter continents versus denser ocean crust floating on asthenosphere. 6. Melting temperature versus geothermal gradient. -why is the outer core liquid and inner core solid when the outer coreís actual
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This note was uploaded on 04/07/2008 for the course GEOG 101 taught by Professor Swanson during the Fall '08 term at University of Washington.

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review_101 - Geology 101 Review Material(Midterm and Final...

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