A sustained flow of water in a hydraulic circuit needs a pump. Similarly, the flow of charge in an electric circuit needs
A. resistance.
B. voltage.
C. current.
D. none of the above
Answer: B
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Describe two ways that changes in the position of Earth's landmasses over geologic time have affected climate
Streams in rainy regions tend to be ________ the saturated zone; as such, we call them ________ streams.
A. disconnected from; gaining B. connected to; gaining C. connected to; losing D. disconnected from; losing
Large ________ extend for considerable distances and depths through rock. Below the surface, there is minimal separation between the blocks on either side
A) vesicles B) master joints C) solution cavities D) glory holes E) faults
Which of the following approaches best helps congested cities deal with the problems related to transportation?
A) double-deck all roads and have more limited-access expressways B) provide access to rail and bus transportation in the inner city or other high-density areas C) make the city transportation "bus only" D) build more roads