Arizona State University GPH 111 Introduction to Physical Geography Quiz 2 Plate Tectonics and Earth's Configuration

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• Question 1 "When old plates get ""sucked under"" newer tectonic plates, what process is operating?" Selected This is the best answer. • Question 2 "Brittle crust can move, because it r... ests on top of the ___________." Selected • Question 3 What is the lightest type of crust? Selected ocean • Question 4 What is paleomagnetism? Selecte d Paleomagnetism is where scientists analyze the ancient magnetic field of sediments in order to understand the age of sediment deposition. New ocean crust is lava. This lava contains magnetic minerals that align themselves with the magnetic field of the earth when they crystallize. Every several hundred of thousands of years, the magnetic field of Earth changes from north to south and back to north. Paleomagnetism is the technique of collecting the lava samples and figuring out the position of the ancient (paleo) magnetic alignment. • Question 5 "The ocean and continental crust that we see is actually submerged. Approximately, how much of the crust is typically submerged (deeply rooted)?" Selected This is the best answer. Tuesday, March 26, 2019 12:06:02 PM MST [Show More]

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