Practice Quiz 10 - 1 The picture above shows a region of hard rock about six inches across from the Grand Canyon The shape and polish of the rock

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1. The picture above shows a region of hard rock about six inches across from the Grand Canyon. The shape and polish of the rock are interesting. It is likely that the rock: A. Was scratched and polished by the hooves of mules carrying tourists into the Canyon along the Bright Angel Trail. B. Was scratched and polished by motion along a fault, which helped open the Canyon so that weathering could lower the Canyon floor. C. Was scratched and polished by the wind, which howls through the Canyon carrying loads of sand eroded from sand bars. D. Was scratched and polished by silt-laden river water, during carving of the Canyon by the Colorado River. E. Was scratched and polished by a glacier, which helped erode the Canyon during the ice age.
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The Canyon was carved by the Colorado River. Glaciers have not been there, and while wind, faults and mule hooves all can change the appearance of rocks, none makes something like this river-polished rock, as we saw in class and you saw in one of the Grand Canyon slide shows. Points Earned: 0/1 Correct Answer: D Your Response: A 2. You start with 400 parent atoms of a particular radioactive type, which decays to give stable offspring. You wait just long enough for three half lives to pass. You should expect to have how many parent atoms remaining (on average): A. 200. B.
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This note was uploaded on 09/01/2010 for the course GEOSC 010 taught by Professor Alley,richardbanandakrishnan,sr during the Spring '08 term at Pennsylvania State University, University Park.

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Practice Quiz 10 - 1 The picture above shows a region of hard rock about six inches across from the Grand Canyon The shape and polish of the rock

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