Astronomy Test 3 - Astronomy Test 1. dating of surfaces...

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Astronomy Test 1. dating of surfaces from counts of impact craters If we can determine the rate at which craters form on a planets surface, we can tell when the last time a surface formed by the number of craters on it. Also if the numbers of craters in different regions is similar, then the whole surface formed around the same time. 2. different volcanic features on Venus, Earth, Mars: describe and explain Venus – vast plains of magma and lava, large volcanoes in the highlands, large shield volcanoes like those on Earth, has every volcanic feature that’s on earth. --Differences due to different composition, lack of plate motion, and a weaker, hotter crust. Mars – huge towering shield volcanoes due to a deeper solid crust that can support a bigger volcano, and lower gravity on Mars. Also has the tallest mountain in the solar system. (Olympus Mons) 3. surface temperatures on Venus, Earth, Mars: describe and explain Venus – 735 K – Dense atmosphere creates a strong greenhouse effect. Earth – 288-293K – greenhouse effect and composition keep planet’s temperature around constant. Mars – 140-300K – Greatly depends on the sun. Little atmosphere because of very little gravitational pull to hold temperatures. 4. different geological features on Venus, Earth, Mars: compare and explain heights of mountains, continents Venus – High volcanoes similar in height to the Himalaya Mountains on earth., no continental drift, but convections of the magma below ground compress and expand the ground causing volcanoes and “pileups” Overall pretty flat. Earth - continental drift, volcanoes, mountains, oceans etc. Mars – huge volcanoes, northern hemisphere is a large ocean basin, southern is
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Astronomy Test 3 - Astronomy Test 1. dating of surfaces...

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