The U.S. center of population has moved steadily to the

A) east.
B) north.
C) south.
D) west.
E) center.


Answer: D

Environmental & Atmospheric Sciences

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Which of the following would be an ion with a double positive charge?

A. an Mg atom that gains one electron B. an Mg atom that loses one electron C. an Mg atom that gains two electrons D. an Mg atom that loses two electrons E. none of the above

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Many automobile engines are cooled by water that flows in a closed circuit through the engine block and the car's radiator. How many different heat transport processes do you find in operation here?

What will be an ideal response?

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Harry Hess proposed the theory of seafloor spreading—the creation of new oceanic crust at mid-ocean ridges

a. True b. False

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Which of the following is the correct name for the first commercially important synthetic polyamide?

A) nylon-6 B) nylon-66 C) nylon-6,10 D) nylon-10,6

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