The North American Manufacturing Belt accounts for
A) 1/3 of the North American population.
B) 2/3 of North American manufacturing employment.
C) 1/2 of North American output.
D) all of the above.
E) only 1/3 of N American population and 2/3 of N American manufacturing employment.
D
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Ice beneath the blades of ices skates is slippery due to
A. solid ice pressurized into liquid water. B. empty spaces in ice crystals being crushed. C. added pressure on the ice surface. D. all of the above
What are depressions in glacial deposits made by the melting of blocks of underlying ice?
a. erratics b. eskers c. arêtes d. kettles
The process by which members of isolated populations become so different in genetic makeup that they cannot produce live, fertile offspring if they are rejoined is best described as
a. geographic isolation b. reproductive isolation c. evolutionary isolation d. endemic isolation e. niche isolation
In a museum collection, you can likely see a
A. meteoroid but not a meteorite. B. meteorite but not a meteoroid. C. meteor but not a meteoroid.