Which example best illustrates potential energy?
A. the wind blowing
B. water in a stream
C. steam
D. a car at the top of a hill
E. electricity
Answer: D
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Before ice forms on a lake, all the water in the lake must be cooled to
A. 4°C. B. a value slightly below 0°C. C. 0°C. D. indeterminate
Under what conditions do carbonates form? What will be an ideal response?
Measured variations in the Sun's emission of radiation and observed changes in the earth's climate:
A) are well understood. B) happen on a 22-year cycle. C) happen on an 11-year cycle. D) have not been clearly linked.
Under which of the following conditions do hurricanes dissipate?
A. when they move over land B. when upper-level outflow of air exceeds surface inflow of air C. when they move over warm water D. when they move into a region of weak vertical wind shear