class35a - (not necessarily all at once Could these facts...

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Friday, Nov. 21 Syllabus, class notes, and homeworks are at: www.as.utexas.edu courses AST 301, Lacy Reading for this week: chapter 16 We’ll go back to the old help session time and place this week: Wednesday at 5:00 in GRG 424 Today: Surface features on Venus and Mars
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Impact craters
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Shield volcanoes: Sapas Mons and Maat Mons
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Mauna Loa visible light and radar
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Global resurfacing There is no evidence of plate tectonics on Venus. Instead there is evidence that the entire surface was covered with lava flows about 750 million years ago
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Unformatted text preview: (not necessarily all at once). Could these facts be related? Inside both the Earth and Venus, heat is generated by radioactive decay of uranium and other elements. In the Earth, this heat gets out when magma comes to the surface or near the surface where its heat can be radiated away. This happens mostly at the mid-ocean ridges, which aren’t found on Venus. Maybe Venus stored up its heat until its crust melted....
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