The flow of charge in a circuit depends on
A. a potential difference.
B. adequate chemical action.
C. adequate resistance.
D. all of the above
Answer: A
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Which is denser: a 100-million-year-old oceanic lithosphere near a convergent boundary, a 15-million-year-old oceanic lithosphere near a rift, or the upper part of the asthenosphere?
A) A 15-million-year-old oceanic lithosphere B) 100-million-year-old oceanic lithosphere C) Upper asthenosphere D) They all have the same density.
Why did the United States refuse to ratify the Kyoto Protocol under both the Clinton and Bush administrations?
The Russian drama began at the end of ________, when the Soviet Union mercifully ended
a. 1991 b. 1995 c. 2000 d. 1985
A rectangular stream pattern consists of long parallel streams with short tributaries entering at right angles
a. True b. False Indicate whether the statement is true or false