Which is true of the continental shelf?
A. It inclines very gently seaward.
B. It is a shallow submarine platform at the edge of a continent.
C. It can vary in width.
D. All of these choices are correct.
Answer: D
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Because many places in which people build homes are at high risk of a physical disaster, some people have suggested that town zoning boards identify such high risk environments as "stupid zones. "Which one of the following would probably not be located in such a "stupid zone"?
A) A new home is built in Iowa, about two feet above normal water levels and 1,000 feet away from the Mississippi River. B) A log cabin home is constructed in a dry, drought-prone, coniferous forest in California. C) A new home in South Dakota sits 200 feet up a hillside, overlooking a vast natural prairie. D) Along the coast of southern Florida, a retired couple builds their dream home on a barrier island.
The primary habitat of the river dolphin is
A) uninhabited by humans. B) subject to periodic fires and drought. C) also inhabited by many other fresh water dolphin species. D) the Sundarbans, the world's largest mangrove forest.
Of the 20 amino acids found in human proteins, how many are essential amino acids?
A) 5 B) 10 C) 15 D) 20
The gas that absorbs most of the harmful ultraviolet radiation in the stratosphere is
a. ?water vapor. b. ?nitrous oxide. c. ?carbon dioxide. d. ozone.? e. ?chlorofluorocarbons.