You wade into the ocean. Where can you stand so that you MIGHT be able to keep your head above water?
A. the abyssal plain
B. the coast
C. the midocean ridge
D. the continental shelf
Answer: D
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Compared with the resultant of a pair of equal-length vectors at right angles to each other, the resultant when the angle is less than 90° is
A. less. B. greater. C. the same. D. need more information
Which use represents the largest share of freshwater in the U.S. that is withdrawn and not returned to its source?
A. crop irrigation B. electricity production C. municipal water use D. motor boat use
In contrast to Earth’s past mass extinctions, what is the cause of current extinctions?
A. decreased insolation B. human activity C. tectonic shifts D. climate change E. species competition
Which of the following statements best describes how this object may have formed?
A. A supernova exploded, probably from the late-stage evolution of a high-mass star. B. Interstellar gas and dust accumulated due to gravity. Some pockets had enough mass to cause star formation. C. Material accumulated into a sphere because of gravity, and it underwent nuclear fusion of hydrogen. D. A star ejected its outer envelope of gas and plasma.