AY 101 Exam 2 Study Guide

Craters how do we estimate the ages of various parts

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craters how do we estimate the ages of various parts of he moon's surface? less cratering means younger surface the atmosphere of venus is ____ and example of _____ very hot and dense; runaway greenhouse effect why is mars red? covered in rust (iron oxides) why are some volcanoes on mars huge compared to earths? mars has weaker gravity and non continental drift compared to earth, how is mars's atmosphere? thinner what is true about mars? mars likely had running water very recently what is jupiter mostly made of? hydrogen what is the great red spot on jupiter? gigantic hurricane below atmosphere why are mercury and the moon geologically dead compared to venus and the earth? - they are too small - lost their internal heat were mercury and the moon every geologically active? yes why do we think venus is geologically active? radar shows features of volcanic activity and plate tectonics
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why is the atmosphere of venus so hot? it has a think carbon dioxide atmosphere which creates a strong greenhouse effect the atmosphere of mars and venus are mostly made of what greenhouse effect? carbon dioxide why is venus' atmosphere so much denser than earth's? - more carbon dioxide - venus doe have water (which dissolves C02) why do we think venus rotates backwards compared to most of the other planets? because it doesn't have water vapor (H20) have we found life on mars? no have we found fossils on mars? no why is mars red? because of its rust - iron oxides have we found running water on mars? yes why do we think mars used to have substantial amounts of liquid water on its surface? it has dried up river beds and other signs of erosion where is the most of the water on mars now? it is permafrost in polar caps what has happened to mars' atmosphere over time? becoming thinner are there active volcanoes on mars? no
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why are the volcanoes on mars so huge compared to mars' size? - weaker gravity on mars - no continental drift how substantial is the atmosphere on mars? why? not very any more - it under went permanent climate change and lose most of its atmospheric carbon dioxide and water to space what are the jovian planets made of? how are they structured? a) hydrogen, helium, and hydrogen compounds b) gassy, low density
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