PHYS 1305 Lecture Notes - Lecture 4: Tidal Locking, Cinder Cone, Geographical Pole
10 Sep 2016
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Average albedo (reflectivity): 0. 1 (30% of earth"s albedo) 2% of sunlight from moon reflected back to space. Impact theory: moon formed by impact between mars-size object and earth in. 4. 5 billion years ago (impacting pieces melted together) Originally thought to be seas by early astronomers. Expectation: some areas can"t get sunlight so ice water can exist. Near side has relatively low topography and heavy elements. Gravity effects influence oceanic tides and currents on earth. Broken up into plates (not consistent with boundaries of oceans and continents) Plates float on middle mantel which is semi-rigid. Sources of seismic waves which can help understand interior structure. Primary wave: body wave analogous to sound (p) Secondary/shear wave (s): body wave analogous to light. Outer core hot so metals in liquid state. Inner core surrounded by liquid fe and ni in outer core. Magnetic field produced by flow of materials around inner core. 12 degrees between magnetic pole and geographic pole.
