Gravity_Lecture - Chapter 16 Gravity(pp 300-303 322-326...

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Force of gravity Shape of the Earth: Sphere, spheroid, geoid Isostasy Survey of India Pratt’s proposal Airy’s counter-proposal Who was right? Making and eroding mountains Chapter 16: Gravity (pp. 300-303, 322-326) Next Lecture: Chapter 21
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Force of gravity Shape of the Earth: Sphere, spheroid, geoid Isostasy Survey of India Pratt’s proposal Airy’s counter-proposal Who was right? Making and eroding mountains Chapter 16: Gravity (pp. 300-303, 322-326) Next Lecture: Chapter 21
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Force of gravity Shape of the Earth: Sphere, spheroid, geoid Isostasy Survey of India Pratt’s proposal Airy’s counter-proposal Who was right? Making and eroding mountains Chapter 16: Gravity (pp. 300-303, 322-326) Next Lecture: Chapter 21
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To a first approximation the earth’s shape is a sphere.
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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).
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Secondly, let’s add the effect of the earth’s 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.
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