AS101 Lecture 19

AS101 Lecture 19 - AS101 Lecture 19 Logistics: Do the night...

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Unformatted text preview: AS101 Lecture 19 Logistics: Do the night lab as soon as you can Midterm 2: Nov 18 same format Covers Chapters 5 - 9 Last Lecture: Geology of Terrestrial Planets Todays Lecture: Geology of Terrestrial Planets (Contd). Searching for geologic cause and effects Plate tectonics only if there is an asthenosphere Asthenosphere needs low viscosity High interior temperature is one way to get low viscosity High interior temperature is needed for volcanism Water stays liquid if planet has the right temperature and a thick atmosphere Formation properties Major properties that are important for planetary geology (these remain unchanged for the life of a planet) Size (determines gravity, SAVR too!) Distance from the Sun (surface temperature) Chemical composition (mass) Rotation rate (magnetic field) Processes that Shape Surfaces Impact cratering Impacts by asteroids or comets Volcanism Eruption of molten rock onto surface Tectonics Disruption of a planets surface by internal stresses Erosion Surface changes made by wind, water, or ice How formation properties and controlling factors determines geology Craters Size Typically 10 times the size of the impactor Depth Typically twice the size of the impactor Shape...
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AS101 Lecture 19 - AS101 Lecture 19 Logistics: Do the night...

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