Continental tropical air masses are most prominent in what part of North America?
A) the Southwestern United States and northern Mexico
B) the Southeastern United States
C) the Pacific Northwest
D) the Midwestern United States and Canada
A
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Phentermine, also called Fastin, is an example of which type of amine?
A) primary aliphatic B) primary aromatic C) tertiary aliphatic D) tertiary aromatic
Which of the following is not an innovation that transformed the prairie from grazing land to cropland?
a. subsurface drainage tile b. wooden plow c. well digging machinery d. barbed wire
The imaginary circle drawn around Earth 23½° to the south of the North Pole is called the _____________
Fill in the blank(s) with correct word
The vast semiarid grasslands of Eastern Europe and Asia are known as
A) chaparral. B) selva. C) mattoral. D) steppe. E) tundra.