Gravity_Lecture - Force of gravity Shape of the Earth:...

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Unformatted text preview: Force of gravity Shape of the Earth: Sphere, spheroid, geoid Isostasy Survey of India Pratts proposal Airys counter-proposal Who was right? Making and eroding mountains Chapter 16: Gravity (pp. 300-303, 322-326) Next Lecture: Chapter 21 Force of gravity Shape of the Earth: Sphere, spheroid, geoid Isostasy Survey of India Pratts proposal Airys counter-proposal Who was right? Making and eroding mountains Chapter 16: Gravity (pp. 300-303, 322-326) Next Lecture: Chapter 21 Force of gravity Shape of the Earth: Sphere, spheroid, geoid Isostasy Survey of India Pratts proposal Airys counter-proposal Who was right? Making and eroding mountains Chapter 16: Gravity (pp. 300-303, 322-326) Next Lecture: Chapter 21 To a first approximation the earths shape is a sphere. We may describe the shape of the earth by a set of three increasing levels of sophistication. The simplest is a sphere, not rotating, covered by a universal ocean (i.e., no differences in elevation of the surface). Secondly, lets add the effect of the earths daily rotation, which is to cause the equatorial region to bulge while flattening the polar regions. We also add layering to the earth (crust, mantle, and core). This more sophisticated model, the spheroid , describes the actual shape of the earth quite accurately. Our third refinement retains the idea of a...
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This note was uploaded on 09/14/2009 for the course GEO 401 taught by Professor Lassiter during the Spring '08 term at University of Texas at Austin.

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Gravity_Lecture - Force of gravity Shape of the Earth:...

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