When did the United States displace Britain as the world's leading superpower?
A) 1780s; immediately after the American Revolution
B) 1830s; during an economic recession in Europe
C) 1870s; with industrial growth following the Civil War
D) 1940s; after World War II
E) 1970s; after the global oil shocks
D
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What occurs when waves hit an obstacle straight on?
a. Wave refraction b. Wave diffraction c. Wave dispersion d. Wave reflection
Which of the following is true of the open stage of a midlatitude cyclone in the Northern Hemisphere?
A) A disturbance develops along the polar front with warm air converging and rising near the surface. B) The faster moving cold front overtakes the slower warm front and wedges beneath it. C) Warm air moves northward along an advancing front, while cold air advances southward. D) The lifting mechanism is completely cut off from the warm air mass.
What is the approximate pKa of a thiol?
A) 5 B) 7 C) 10 D) 14
Which of the following is the acronym for the system of U.S. Department of Defense satellites, which are used to establish exact locations on Earth?
A) GIS B) Landsat C) GPS D) EOS E) Color infrared