One practical radioactive system used to date lava flows involves A The gas

One practical radioactive system used to date lava

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4., One practical radioactive system used to date lava flows involves:, A., The gas argon-40, which decays to the gas potassium-40. B., The gas argon-40, which decays to solid potassium-40.C., The solid potassium-40, which decays to the solid grahamspanierum-41.D., The solid potassium-40, which decays to solid argon-40.E., The solid potassium-40, which decays to the gas argon-40. Potassium-40 is common in solid minerals, and decays to produce the gas argon-40. And despite his great contributions to humanity, no one has named an isotope after Penn State’s president. , Points Earned: , 0/1 Correct Answer: , E Your Response: , C
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, 5. , 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 wind, which howls through the Canyon carrying loads of sand eroded from sand bars. B. , Was scratched and polished by a glacier, which helped erode the Canyon during the ice age. C. , Was scratched and polished by the hooves of mules carrying tourists into the Canyon along the Bright Angel Trail. D. , Was scratched and polished by motion along a fault, which helped open the Canyon so that weathering could lower the Canyon floor. E. , Was scratched and polished by silt-laden river water, during carving of the Canyon by the Colorado River. 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: , E Your Response: , B
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/// ,  1 Points Missed  4 Percentage  20% 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 silt-laden river water, during carving of the Canyon by the Colorado River. 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 a glacier, which helped erode the Canyon during the ice age. E. , Was scratched and polished by motion along a fault, which helped open the Canyon so that weathering  could lower the Canyon floor. 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.
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  • Fall '08
  • ALLEY,RICHARDBANANDAKRISHNAN,SR
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