The 90° angle solar rays are striking the Tropic of Cancer on ________
A) March 21 B) September 21 C) December 21 D) June 21
D
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A transverse current is a ____
A) bottom current flowing in the same direction as an overlying surface current B) surface current that connects eastern-boundary and western-boundary currents C) cold surface current that flows from the poles toward the equator D) theoretical current not yet discovered
High-frequency sound emits a high
A. amplitude. B. pitch. C. speed. D. all of the above
Why doesn't the Moon fall toward Earth like apples do?
A. Moon does fall, but it falls around Earth due to its tangential motion. B. The great distance of the Moon prevents falling C. Moon does fall but its great distance keeps it from getting closer. D. Moon's small mass prevents falling.
If global fertility rates remain at 2008 levels, the United Nations predicts that world population will surpass ________ billion in 2050
A) 7 B) 5 C) 9 D) 10 E) 4