The present oceans have been created during the last ________.
A. 20 million years
B. 2 billion years
C. 225 million years
D. 2 million years
E. 2250 million years
Answer: C
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A ground fire in a pine forest in southern Florida
A) makes crown fires more likely in the burned regions. B) will cause the permanent extinction of small plants in the burned regions. C) will kill most of the pines in the burned area. D) promotes nutrient cycling in the burned regions.
All of the following are major steps to controlling air pollution except ________
A) identification of the pollutants B) determination of major sources of pollutants C) implementing strategies to meet the air pollution standards D) finding cures for the diseases caused by air pollutants E) developing agreements among countries to limit air pollution
An increasingly complex division of labor has been fueled by
A) a rise in the proportion of non direct production workers. B) the aging of the baby boom. C) rising incomes. D) firms no longer need administrative bureaucracies. E) service exports.
The oceans contain approximately ________ percent of all water on Earth
A) 0.7 B) 17 C) 57 D) 77 E) 97