Carcinogens may be difficult to identify and study because ________
A) cancer may be caused by chronic, long-term exposure
B) there is no way to measure the carcinogenic potential of a substance
C) they are rare in nature
D) they are the least common of the toxic substances
A
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What is another name for swidden agriculture or shifting cultivation?
A) pastoral nomadism B) industrial agriculture C) livestock ranching D) slash-and-burn agriculture E) dairy farming
A ________ is a ridge of sediment that cuts a bay off from the ocean.
A. barrier island B. tombolo C. spit D. beach E. berm
Hetch Hetchy provides the residents of San Francisco with ________
A) forest for recreation B) lakes for fishing C) water for drinking D) wilderness habitats E) miles of biking and hiking paths
Which of the following activities use the greatest amount of water in the United States?
A. electrical generation and industrial B. industrial and irrigation C. industrial and municipal supply D. irrigation and electrical generation E. irrigation and municipal supply