The theory of continental drift is credited to
A. H. H. Hess.
B. W. Loma Prieta.
C. J. Tuzo Wilson.
D. Alfred Wegener.
Answer: D
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A vibrating bob at the end of a vertical spring completes a cycle every 2 s. Its period is
A. 1 s. B. 0.5 s. C. 2 s. D. more than 2 s.
Nitrates and phosphates are examples of
a. disease-causing agents b. oxygen-demanding wastes c. organic chemicals d. plant nutrients e. Sediment
During the most intense phases of global cooling in the fourteenth century, average temperatures fell by as much as
a. two or three degrees.
b. one or two degrees.
c. three or four degrees.
d. four of five degrees.
Where is the difference between frontal boundaries so slight that the uplift necessary to create thunderstorms is lacking?
A. Southwest B. Southeast C. Northeast D. Pacific Northwest