EASC 108 Lecture Notes - Lecture 8: Outer Core, Inner Core, Supercontinent
18 Dec 2015
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Document Summary
Large world remain warm inside, promoting volcanism and tectonics. Larger worlds also have more erosion because their gravity retains atmosphere. Planets close to sun too hot for rain, snow ice. Hot planets have more difficulty retaining atmosphere. Planets far from sun too cold for rain, limiting erosion. Planets with liquid water have the most erosion. Venus = 243 day cycle jupiter = 9. 9 hour cycle. Planets with slower rotation have less weather, less erosion and a weak magnetic field. Planets with faster rotation have more weather, more erosion and a stronger mag field. Gravity pull higher density material to center, lower density rises to surface and the material ends up separated by density. Planet" outer layer of cool rigid rock is lithosphere. Floats on the warmer, softer rock that lies beneath. Ring of fire cause by subduction zones. Hawaiian island formed where a plate is moving over a volcanic hot spot. From continental drift to plate tectonics: seafloor spreading hypothesis.
